Author: Charlotte H

The Seiko Turtle is one of the most recognizable dive watches in the world. It has a storied history, a distinctive design, and a reputation for being both durable and reliable.

So no, the Seiko Turtle isn’t some rare breed of turtle—if that’s what you’re looking for, you might want to check out the National Geographic website instead.

No, this is the nickname given to one of Seiko’s most iconic dive watches, and it’s called the Turtle because of its distinct, cushion-shaped case that resembles a turtle’s shell. 

Seiko first introduced the Turtle back in the 1970s with the legendary 6306 and 6309 models, and since then, the watch has seen multiple reissues, each staying true to its roots while incorporating subtle but necessary modern improvements.

Today, the Seiko Turtle lineup includes a variety of models, all sporting the signature case shape, bold dials with plenty of lume, impressive water resistance, and reliable in-house automatic movements.

While most of these variations have obvious differences, whether it’s case size, dial colors, bezel inserts, or added complications, there are two models that look almost identical: the Seiko Turtle SRP777 and the Seiko Turtle SRPE93. 

If you’re not super familiar with these two watches, you’d be forgiven for struggling to spot any differences between them at all.

Seriously, if you can pick them apart in just a few seconds, you deserve some serious brownie points. But yes, there are subtle differences, and as any watch collector will tell you, even the smallest differences in a watch can have a big impact, whether it’s on how a watch wears, how it looks, or just how it feels on the wrist. 

So today, we’re putting the Seiko Turtle SRP777 and SRPE93 head-to-head, breaking down every little detail, so you’ll know exactly which one is the better choice for you.

The Seiko Turtle SRP777

Starting with the older of the two, the Seiko Prospex Turtle SRP777 is a modern reissue of the legendary Seiko 6309, a famous dive watch that the Japanese watchmaker first launched during the late 1970s.

This modern-day SRP777 reference however arrived in early 2016 but still retained many of the signature Turtle features including the cushion-shaped case, bold dial design, and robust diving capabilities that made its predecessor such a hit. 

At first glance, the SRP777 appears nearly identical to its vintage inspiration, measuring to 44.3mm in diameter with a lug-to-lug of 47.25mm. The stainless steel case features a brushed finish on the top and polished sides, maintaining the classic Seiko diver aesthetic.

Again, it’s the unusual shape of the case that gives the Turtle its nickname with a rounded, ergonomic, and undeniably comfortable profile. Despite its large dimensions, the watch wears smaller than expected due to its short lugs, making it surprisingly wearable on a variety of wrist sizes. 

One of the standout features of the SRP777 is its day-date window. Unlike more modern Seiko divers like the SRPE93, the SRP777 retains a beveled day-date window as a direct homage to the original 6309.

This small yet significant detail enhances the vintage appeal of the watch and is one of the main components that sets it apart from its younger sibling. For collectors and enthusiasts who appreciate the little nuances that make a watch special, this beveling adds a layer of depth and nostalgia. 

The dial is a rich matte black, offering excellent legibility in various lighting conditions. Large, well-defined hour markers are generously coated with Seiko’s proprietary LumiBrite, ensuring that the watch remains highly readable even in low-light environments.

The hands follow a classic Seiko diver design, with a broad arrow-style minute hand and a sword-shaped hour hand, making it easy to distinguish the time at a glance. The seconds hand features a lumed lollipop tip, another nod to traditional Seiko diver aesthetics. 

The bezel is a unidirectional 120-click mechanism with a fully indexed aluminum insert. The action is smooth with firm, precise clicks, making it a joy to operate. Seiko’s bezels are known for their reliability, and the Seiko Turtle SRP777 is no exception, providing an essential tool for divers to monitor elapsed dive times. 

The case back of the SRP777 is another area where Seiko has paid tribute to its past and offers another slight deviation from the SRPE93. The SRP777 features the iconic tsunami wave motif, deeply engraved and prominently displayed, alongside lettering that reads “Air Diver’s 200m”. 

Inside the watch beats Seiko’s in-house 4R36 automatic movement, a workhorse caliber that offers hacking and hand-winding. It also operates at 21,600 vibrations per hour and provides a respectable 41-hour power reserve.

It’s a reliable and robust movement, designed for longevity and ease of maintenance. It’s so reliable that Seiko still uses it in many of the dive watches today. Completing this model is a 22mm black silicone strap that is soft, flexible, and comfortable straight out of the box.

The Seiko Turtle SRPE93

Arriving a little later in 2021, and a watch still in production now, the Seiko Prospex SRPE93, is unsurprisingly another modern take on the Seiko Turtle design.

Much like its predecessors, this model stays true to the core identity of the Seiko Turtle, offering a cushion-shaped case, robust dive watch capabilities, and a timeless aesthetic. 

At 45mm in diameter with a thickness of 13.42mm, the Turtle SRPE93 is slightly larger than the SRP777 but still retains an ergonomic and well-balanced profile on the wrist.

Thanks to its rounded case and relatively short lug-to-lug length, the watch again wears smaller than its dimensions might suggest, making it comfortable for a wide range of wrist sizes. The case is engineered from classic stainless steel and features a brushed finish on the top with polished sides. 

The dial of the Seiko Prospex Turtle SRPE93 is also deep matte black, ensuring excellent contrast and legibility. At the centre are the same large and highly visible hour markers coated with Seiko’s LumiBrite. But peeking out just to the right of the dial is one of the subtle but notable differences between this model and the Turtle SRP777. 

Here you can see the addition of a lume block at the 3 o’clock marker. This lume pip was added to retain the ISO certification, as it is part of the new requirement.

In addition, to accommodate this change, the Seiko Turtle SRPE93 does not have the beveling on the day/date window that was present on the SRP777.

Another update lies in the case back. While it still features the iconic tsunami wave motif, the text has been updated to again reflect the new ISO diving specifications. Instead of the previous “Air Diver’s 200m” marking found on the SRP777, the case back of the Turtle SRPE93 now reads “Diver’s Watch 200m.”

This subtle change may go unnoticed by casual observers, but for Seiko enthusiasts, it represents an important update that aligns with modern dive watch standards. 

Other than that, the SRPE93 retains all the same spec as its older sibling. It has the same unidirectional rotating black aluminium bezel, Seiko’s reliable in-house 4R36 automatic movement with a 41-hour power reserve and a comfortable black silicone strap, secured with a pin buckle.

Seiko SRP777 vs SRPE93 – How to Choose 

The Case Size 

While both watches share the signature Seiko Turtle design, the SRPE93 comes in slightly larger at 45mm compared to the SRP777’s 44.3mm diameter.

The difference might seem minimal on paper, but on the wrist, even a fraction of a millimeter can impact the overall feel. The SRP777’s more compact dimensions make it a great option for those who prefer a slightly more manageable fit without sacrificing the iconic cushion-shaped case.

On the other hand, if you like the presence of a slightly larger case, the SRPE93 will give you that extra bit of wrist real estate while maintaining excellent wearability thanks to the short lug-to-lug distance. 

The 3 o’clock Lume 

One of the most notable updates in the Seiko Prospex Turtle SRPE93 is the addition of a lume pip at the 3 o’clock marker. This was introduced to meet the latest ISO dive watch standards to ensure enhanced visibility in low-light conditions.

However, this adjustment led to the removal of the beveling around the day/date window, which remains intact on the SRP777. If you appreciate the vintage-inspired detail and added depth that the beveling provides, the SRP777 might be the more appealing option.

However, if you prioritize lume and low light legibility, then the SRPE93’s additional Lumibrite pip will no doubt serve you better. 

The Case Back Decoration 

Both watches feature the classic Seiko tsunami wave motif on the case back, a signature design element in the Prospex series. However, the text has been updated in the SRPE93 to reflect modern ISO certification requirements. The SRP777’s case back reads “Air Diver’s 200m,” while the SRPE93 now simply states “Diver’s Watch 200m.”

While this change does not impact performance, some collectors might prefer the original wording as a nod to Seiko’s long-standing dive watch heritage. 

Which One Is Right for You? 

Choosing between the Seiko Prospex Turtle SRP777 and SRPE93 ultimately depends on what you prioritize in a dive watch.

If you appreciate subtle vintage aesthetics and small nostalgic details like the beveled day/date window and original case back text, and prefer a slightly more compact fit, the SRP777 is a fantastic choice.

However, if you’re looking for a more modernized version with updated ISO compliance, superior lume at the 3 o’clock position, and don’t mind the lack of beveling, then the SRPE93 is the way to go.

Conclusion

At the end of the day, choosing between the Seiko Prospex Turtle SRP777 and the SRPE93 comes down to personal preference. If I had to pick, I’d go for the Seiko SRPE93 simply because I believe you can never have too much lume on a dive watch.

The additional lume at the 3 o’clock marker ensures even better visibility in low-light conditions which is a key factor for me. 

That said, I completely understand why many collectors are drawn to the Turtle SRP777. It carries a piece of Seiko’s history with its vintage-inspired design elements, including the beveled day-date window, which adds a nostalgic charm. For those who appreciate subtle nods to classic models, the SRP777 is an appealing option. 

Practicality is another consideration. The SRPE93 is still in production and can be ordered easily, typically retailing for around $495. It offers a lot of watch for an affordable price, making it a solid choice for those who want a brand-new, readily available timepiece.

On the other hand, the SRP777 has been discontinued, meaning you’ll need to explore the second-hand market for this one. While pre-owned models are generally more affordable, averaging around $400, they may be harder to find in good condition. 

Ultimately, these two watches are incredibly similar in both aesthetics and specifications. To the untrained eye, it would take a keen collector to spot the differences when one is on your wrist.

But in the end, what matters most is what you value in a watch, whether it’s modern practicality or vintage charm. No matter which you choose, both are excellent examples of Seiko’s dive watch prowess, proving that the Turtle remains a true icon in the world of horology.

The Tudor Black Bay lineup is one of the most versatile collections in the world of luxury watches, offering countless variations in case metal, dial color, and even complications.

But two of the most iconic models are the original Black Bay, the 41mm flagship, and its smaller sibling, the Black Bay 58, which sports a more compact 39mm case. 

While they might seem similar at a glance, there are some key differences that go beyond just size. Certain dial colors and case materials are exclusive to one model, and how these watches wear on your wrist can vary dramatically depending on the configuration you choose. 

Ultimately, the decision between these two heavy hitters comes down to your style preferences, wrist size, and how you want the watch to feel day to day.

The larger Black Bay has a bolder, more commanding presence, while the Black Bay 58 leans into vintage proportions and a more understated look. Both have their unique charm and of course their own price tag too, so it’s worth taking a closer look at what sets them apart before you pull the trigger. 

In this guide, we’ll break down the key differences and help you figure out which Tudor Black Bay is the perfect match for you. 

A Quick Background on the Tudor Black Bay Collection As A Whole

The Tudor Black Bay collection is one of the most compelling line-ups in modern watchmaking. It’s a testament to Tudor’s ability to draw on its rich history while offering something distinctly contemporary.

For decades, Tudor was long seen as Rolex’s younger sibling, sharing much of the same DNA but with its own more affordable, no-nonsense approach to tool watches.

When the Black Bay launched in 2012, it was clear that Tudor wasn’t just following trends, or in the footsteps of its better known brother anymore but redefining its place in the modern watch landscape. 

On its release, the Black Bay clearly took inspiration from Tudor’s early Submariner models, particularly references from the 1950s and 1960s. You’ll notice the signature “snowflake” hands, a design Tudor introduced in the late 1960s for better underwater visibility, as well as the oversized crown and domed crystal, both nods to vintage dive watches.

But while the design leaned heavily into heritage, the execution was undeniably modern bringing together classic aesthetics with contemporary build quality and robust in-house movements. 

Since its debut, the Black Bay collection has expanded significantly, catering to nearly every preference. There’s the original Black Bay with its 41mm case, available in multiple bezel and dial color combinations, from the iconic burgundy bezel to a more understated blue or black.

The proportions are bold, making it an ideal statement piece while still maintaining the versatility that dive watches are known for.

Then there’s the Tudor Black Bay 58, a model that’s quickly become a favorite among enthusiasts. Named after Tudor’s first dive watch, released in 1958, this version scales things down with a 39mm case and slimmer profile, closer to the vintage proportions of mid-century dive watches.

The Black Bay 58, or Black Bay Fifty-Eight as it’s sometimes called, is perfect for those who prefer a more discreet, wearable option that retains all the charm of the original without the added heft. 

Beyond these core models, the Black Bay family includes more specialized variations. The Black Bay GMT is a standout, with its blue-and-red bezel and dual-time functionality which is a direct nod to Tudor’s shared aviation heritage with Rolex.

Meanwhile, the Black Bay Chrono combines dive-watch ruggedness with motorsport-inspired styling, offering both versatility and technical complexity.

The Black Bay Ceramic is arguably the most modern interpretation, with an all-black case and METAS-certified movement, bringing cutting-edge technology to the collection’s vintage-inspired roots. 

Tudor has managed to strike the perfect balance between tradition and innovation, evolving the Black Bay line without losing its identity.

What makes the collection so compelling is how it captures the spirit of classic dive watches without feeling stuck in the past. Each model offers something unique while staying true to the utilitarian ethos that defines Tudor. 

Today, we’ll be focusing on two core sub-collections within the Black Bay family: the classic 41mm time-only Black Bay and its smaller, vintage-inspired sibling, the Black Bay Fifty-Eight. Both are strong contenders, but they cater to different tastes and needs. Let’s take a closer look at how they compare. 

The Tudor Black Bay Collection 

The Tudor Black Bay 41mm models are the cornerstone of the Black Bay collection, staying true to the original design DNA that put Tudor back on the map in 2012.

These watches are classic in their execution, with a design rooted in vintage dive watches but built to modern standards. At 41mm in diameter and 13.6mm thick, they wear confidently on the wrist without being overpowering, offering a balance of bold presence and everyday versatility. 

The core models feature a stainless steel case with polished and satin finishing, paired with a unidirectional 60-minute dive bezel made from stainless steel with an anodized aluminum insert.

These aluminum bezels give the watch a distinctly vintage feel, while the domed sapphire crystal and clean dial layout emphasize legibility.

The dials are primarily matte black, with applied hour markers and Tudor’s signature snowflake hands, an unmistakable feature dating back to the brand’s military dive watches of the late 1960s. Water resistance is rated to 200 meters, making these watches as functional as they are stylish. 

Inside the Tudor Black Bay 41mm watches is the Tudor Manufacture Caliber MT5602, a self-winding movement with a bidirectional rotor system. It’s built for durability and accuracy, boasting a 70-hour power reserve, which means you can set the watch down for the weekend and still pick it up on Monday with power to spare.

The movement is also COSC-certified, ensuring precise timekeeping, and it’s protected by a stainless steel screw-down crown adorned with the Tudor rose. 

The 41mm Black Bay range offers a surprising variety of configurations to suit different tastes. The classic option is the black dial and black bezel combo; it’s understated and timeless.

For something with a touch of warmth, there’s the red bezel paired with a black dial and gilt hands, which give off a distinctly retro vibe.

Then there’s the green bezel variant, which has gained a lot of attention for its bold yet versatile look. The green bezel is paired with a black dial and gilt accents, creating a color combination that feels both vintage-inspired and fresh. 

For those looking for a more contemporary take, the Black Bay Ceramic is a standout. This model reimagines the Black Bay design with a full ceramic case and bezel, offering a stealthy, ultra-modern appearance.

Ceramic is not only lightweight but also highly scratch-resistant, giving this model exceptional durability while maintaining a sleek, matte-black finish. It’s a watch that feels entirely different from its steel siblings with an edgy, minimal, and almost futuristic touch. 

Then we have the Tudor Black Bay S&G (Steel & Gold) models, which introduce a touch of luxury to the Black Bay family.

These two-tone watches feature a mix of stainless steel and yellow gold, with gold accents on the crown, bezel, and bracelet center links. You can opt for a black dial and bezel for a sporty-yet-refined look or go full vintage glamour with a champagne dial paired with matching golden hardware. 

When it comes to pricing, the 41mm Tudor Black Bay models remain incredibly competitive in the luxury watch world.

The stainless steel models start at $3,950 for versions on leather or textile straps, while those on steel bracelets are priced slightly higher. The S&G models, with their combination of precious metal and sporty design range from $5,550 to $6,300, depending on the configuration.

The Tudor Black Bay 58 Collection

The Tudor Black Bay 58 has quickly become one of the most beloved sub-collections in the Black Bay family, offering a vintage-inspired design in a more compact 39mm case.

It’s named after the year 1958, which saw the release of Tudor’s first 200m water resistant dive watch, the Oyster Prince Submariner Ref. 7924, a watch that serves as the clearest ancestor to today’s Fifty-Eight models.

With its modest size, slim profile, and vintage proportions, the Black Bay Fifty-Eight feels like a sweet spot between heritage aesthetics and modern watchmaking. 

At the heart of the Black Bay 58 is the Tudor Manufacture Caliber MT5402, a COSC-certified movement specifically designed for smaller cases. Like its larger sibling, it offers a robust 70-hour power reserve and features a bidirectional rotor system.

This makes it a reliable choice for daily wear, as you can take it off for the weekend and still have it ticking when you pick it up on Monday.

The case is only 11.9mm thick which is a nice bit slimmer than the 41mm Black Bay models making it extremely comfortable on the wrist, especially for those who prefer a more traditional size. 

The steel models are the core of the collection. There’s the timeless black dial and black bezel version with gilt accents, which harks back to early dive watches with its warm, vintage tones.

For something a bit fresher, the navy blue version swaps out the gilt details for white and silver, offering a more contemporary look that’s clean and sporty. Both models come with a riveted steel bracelet, textile strap, or leather option, giving you some flexibility in styling. 

While the classic Tudor Black Bay 41 comes in steel, bronze and S&G, the Tudor Black Bay 58 has some very cool case metals that are exclusive to the collection.

One of the most eye-catching is the Black Bay 58 925, which features a case made entirely from sterling silver, something of a rarity in the watch world.

The case is satin-finished, giving it a warm, almost matte appearance, while the taupe dial and matching bezel keep things understated and elegant. Unlike traditional silver, Tudor’s proprietary alloy resists tarnishing, so you won’t need to worry about the watch developing a patina over time. 

Then there’s the Black Bay 58 18K, which takes things to a whole new level. This version is made entirely from solid 18k yellow gold. It’s definitely a bold statement piece but one that still manages to maintain the Fifty-Eight’s vintage charm.

The dark green dial and bezel contrast beautifully with the gold case, creating a rich and luxurious aesthetic. It currently comes on either a green fabric strap, a brown leather band or a full gold bracelet. 

In terms of pricing, the Black Bay 58 again remains competitively positioned in the luxury watch market. The stainless steel models start at $3,850, offering incredible value for a watch with an in-house movement and 200m water resistance.

The 925 silver version is priced at $4,800, reflecting its unique case material and understated elegance. Unsurprisingly, the 18k yellow gold model with the full gold bracelet tops the range at $33,700.

Tudor Black Bay vs Black Bay 58 – How to Choose 

When deciding between the Tudor Black Bay 41mm and the Black Bay 58, the choice can feel overwhelming at first.

Though these two models share much of the same DNA, their differences in size, materials, and overall aesthetic mean they cater to different preferences and wrist sizes. Understanding these distinctions will help you determine which one is the right fit for you.

The most obvious difference between the two is size. The Black Bay has a 41mm case with a thickness of 13.6mm, giving it a bolder and more substantial presence on the wrist.

It wears confidently and is perfect for those who appreciate larger dive watches. Its proportions strike a balance between modern sportiness and vintage-inspired design, making it a versatile piece that can command attention without feeling over the top.

The Black Bay 58, on the other hand, is more compact with a 39mm case and a slim 11.9mm profile. These vintage proportions make it feel more like a classic dive watch from the 1950s, an intentional nod to Tudor’s first 200m water-resistant dive watch from 1958. Its smaller size makes it more discreet, ideal for those who prefer a lighter, more wearable timepiece that transitions effortlessly from casual to formal settings. While the Black Bay has an undeniably bold wrist presence, the Black Bay 58 leans into subtlety and vintage charm. 

Beyond size, the two models also differ in terms of available case materials. The Black Bay offers a broad range of options, from classic stainless steel to two-tone steel and gold (S&G) models, as well as the ultra-modern Black Bay Ceramic.

The two-tone S&G models bring a touch of luxury with their mix of stainless steel and yellow gold, while the Black Bay Ceramic reimagines the classic dive watch with a matte-black case that is both scratch-resistant and modern. 

The Black Bay 58 takes a more creative approach with its exclusive case materials. While the core models are available in stainless steel, there are also versions in sterling silver, 18k yellow gold, and bronze.

For those that want something arguably flashy, you’ll no doubt love the Tudor Black Bay 58 18K with its full 18kt gold case paired with a green bezel and dial for a luxurious yet vintage-inspired aesthetic.

In terms of performance, both models are powered by Tudor’s robust in-house movements. The Black Bay uses the Caliber MT5602, while the Black Bay 58 is equipped with the Caliber MT5402, which is specifically designed for smaller cases.

Both movements offer an impressive 70-hour power reserve and are COSC-certified for accuracy, meaning they’re equally reliable whether you choose the larger or more compact model.

The main difference lies in how the movements contribute to the overall wearability of the watches. The MT5602 supports the larger, thicker case of the Black Bay, while the MT5402 helps keep the Black Bay 58 slim and lightweight. 

Aesthetically, the Black Bay and Black Bay 58 deliver very different experiences. The Black Bay is bold and contemporary, with broader proportions and a more commanding presence.

It feels modern while retaining some vintage-inspired design cues, like the domed sapphire crystal and snowflake hands. This makes it a great choice for someone who wants a watch that stands out and pairs well with casual or sporty attire. 

The Black Bay 58, by contrast, fully embraces vintage proportions and mid-century dive watch aesthetics. Its smaller case, warm gilt accents (on some models), and understated design give it a nostalgic charm that appeals to enthusiasts who appreciate heritage watches. Its slim profile and refined look also make it easier to dress up, giving it more versatility for formal occasions.

Conclusion 

Ultimately, the decision between the Tudor Black Bay and the Black Bay 58 comes down to personal preference. If you prefer a larger, bolder watch with strong wrist presence, the Black Bay is likely the better choice. Its broader range of materials and configurations also makes it an appealing option for those who want to experiment with two-tone designs or more modern aesthetics.

On the other hand, if you’re drawn to vintage proportions, heritage-inspired details, and unique case materials like sterling silver or solid gold, the Black Bay 58 will be hard to resist.

Whichever model you choose, both the Tudor Black Bay and Black Bay 58 offer exceptional build quality, reliable in-house movements, and timeless designs that stay true to Tudor’s history while delivering modern performance.