With the Endeavour Minute Repeater Cylindrical Tourbillon Skeleton, H. Moser & Cie. unites three of watchmaking’s most demanding expressions: a fully skeletonised architecture, a minute repeater brought dial-side, and a flying tourbillon equipped with a cylindrical hairspring. Each element is complex on its own. Together, they create a unique watch where the interaction of sound, motion, and structure is on full display.
The minute repeater is brought to the forefront, with hammers and gongs displayed dial-side. One of the most complex constructions ever developed by H. Moser & Cie., this configuration required a complete rethinking of the movement architecture. Material is reduced to the strict minimum to preserve both thinness and wearability, while ensuring an unobstructed view of the fully skeletonised mechanism.
Traditionally positioned on different levels, the gongs are here integrated on a single plane — a true technical feat demanding extreme precision in their shaping, alignment, and tuning. Volumes are meticulously recalibrated, and every component refined for both performance and visibility.
The hollowed titanium case is conceived as a resonance chamber, amplifying and sustaining each vibration. The result is a chime that is both precise and expressive.
The flying tourbillon adds a second layer of complexity. Conceived to counteract the effects of gravity on the watch’s timekeeping precision, it demands exceptional craftsmanship to produce. Placing it within a fully skeletonised movement intensifies the challenge. Suspended within a play of light and tension, the tourbillon appears in constant dialogue with the repeater mechanism. Two mechanical languages, oscillation and vibration, united within the same open space.
Powering this composition is the hand-wound manufacture calibre HMC 909, entirely skeletonised and built as a three-dimensional structure. Integrating over 400 components, it brings together the minute repeater and flying tourbillon within a single architecture, offering full visibility into its mechanical complexity. With its 90-hour power reserve and components finished and decorated by hand, this is traditional watchmaking pushed to its limits.
