Armin Strom Gravity Equal Force Ultimate Sapphire Purple
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Reference Number: ST24-GEF.SA.AC.M.A7.FC

Armin Strom Gravity Equal Force Ultimate Sapphire Purple

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An unprecedented feat of micromechanical ingenuity demonstrated through a singular design, the Gravity Equal Force with a grey transparent sapphire offset dial and guilloché purple movement plate by Kari Voutilainen is the first automatic watch endowed with an equal force transmission integrated directly in the mainspring barrel – on full display from the dial side. The result is consistent power transmission to the regulating organ, ensuring unwavering precision throughout the watch’s autonomy.


With an emphasis on transparency, as well as highlighting kinetic elements, the Gravity Equal Force stands out as a technical tour-de-force with an instantly recognisable look – outstanding in form and function, finished by meticulous hand decoration.

The new Gravity Equal Force Ultimate Sapphire sports a striking purple guilloché-engraved mainplate by Kari Voutilainen. The crowning glory is a light grey nubuck leather strap with purple stitching and keepers. The new edition is limited to a run of 25 pieces per year.


At once regal and electric, the latest edition of the Gravity Equal Force features a colour Armin Strom has never used before. Its base plate boasts a guilloché engraved motif with a barley grain pattern, expertly handcrafted in the atelier of acclaimed independent watchmaker Kari Voutilainen using a traditional rose engine lathe.

The striking purple colour reflects a wide spectrum of tones as it shifts with the light. Making this edition even more outstanding, the small off- centred dial is crafted from transparent sapphire crystal, which is reserved exclusively for the Gravity Equal Force’s Ultimate Sapphire Editions.


Like a canvas for artistic expression, superlative hand-finishing applied by specialised watchmakers and seasoned artisans can be appreciated throughout the Gravity Equal Force and its many proudly exposed layers and components.

Polished bevels (anglage) on the bridges, black polished screws, polished counter sinks, perlage and various types of graining, be it straight or circular, as well as Geneva stripes on the three-quarter bridge visible through the case’s back.

One of the Gravity Equal Force’s most distinctive elements is the triplet of dark grey ruthenium-plated bridges that occupy the right-hand portion of the open display. Inspired by the finger-style bridges found in pocket watches, it takes up to an entire day for these bridges to be embellished by hand.

Watch Features

CaseStainless Steel
Case BackSapphire Crystal with anti-reflective
Case Width41mm
Case Thickness12.65mm
CrystalSapphire Crystal with anti-reflective
Dial ColorGrey toned off-center sapphire dial with subdial
HandsFaceted polished hands and Super-LumiNova® filling
Dial MarkersArabic Numerals
FunctionsHour, minute, small second, Patented Stop-Work declutch mechanism and Equal Force Barrel, Handmade guilloche pattern on the purple movement plate by Kari Voutilainen
MovementAutomatic with micro rotor turning on dial side, Caliber ASB19, Power reserve 72 hours
Water Resistance30m
Bracelet StrapGrey nubuck leather strap
Clasp TypePin buckle or Folding clasp
Warranty5 Year
BrandArmin Strom
Additional InformationLimited Edition of 25 Pieces

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Cost: Varies based on country. We will inform you of the shipping cost before purchase.

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