WATCHES AND WONDERS 2026 H. Moser & Cie. ENDEAVOUR MINUTE REPEATER CYLINDRICAL TOURBILLON SKELETON: SOUND WITH AN OPEN HEART

At H. Moser & Cie., we don’t hide our complications. They are meant to be seen and heard. With the Endeavour Minute Repeater Cylindrical Tourbillon Skeleton, the Schaffhausen-based Manufacture pushes this approach to its limit: a fully skeletonised minute repeater, with its mechanism in the foreground, paired with a flying tourbillon equipped with a cylindrical hairspring. Two pinnacles of traditional watchmaking brought together in a single piece with a resolutely contemporary architecture, housed in a 40 mm titanium case. Time as a spectacle. Placing the hammers and chimes on the dial side is not merely an aesthetic choice; it’s a deliberate statement. The minute repeater steps out of the shadows to take centre stage. This radical construction required a complete rethinking of the movement: curved chimes, positioned on the same plane, with volumes precisely adjusted. Everything is visible, therefore everything must be flawless. Full skeletonisation takes this logic to its extreme. Openworked bridges, airy structures, the interplay of space and tension: this watch truly breathes. The gaze moves freely, drawn to the details, held by the balance of the whole.

At 2 o’clock, an unexpected counterpoint interrupts this deliberate transparency: a small domed sub-dial, Funky Blue fumé with the H. Moser & Cie. logo in transparent lacquer, like a secret signature. A burst of colour at the heart of the mechanics, the time is displayed serenely, almost weightlessly, while everything around it vibrates, moves and resonates.

The 40 mm case is not merely a display element; it is an instrument. Everything has been designed for sound. The sliding bolt, mounted on a Teflon runner, is integrated into the main plate to optimise space. The case middle has been hollowed out as much as possible to create a genuine sound box. Each volume contributes to the transmission of vibrations.

The choice of titanium is self-evident. Light, rigid and with low damping, it preserves vibrational energy instead of dissipating it. The result is a chime that is fuller, longer and clearer. A note that lingers, perfectly placed. Because producing a functional minute repeater is one thing. Creating a perfectly tuned melody is something else altogether.

And this sonic architecture contains an added dimension: a one-minute flying tourbillon equipped with a cylindrical hairspring. Inherited from 18th-century marine chronometers, this hairspring rises perpendicularly around the upper stem of the balance staff. Its concentric geometry improves isochronism and reduces friction,qualities further enhanced when paired with a tourbillon. Today, the cylindrical hairspring is difficult to produce because it requires specialised expertise and tools. The teams at Precision Engineering AG, H. Moser & Cie.’s sister company, have revived this expertise, with each cylindrical hairspring shaped by hand – a process that takes ten times longer than for a traditional spring.

Suspended within this openworked architecture, the tourbillon appears to float, interacting with the hammers and chimes. The attention moves from sound to movement, from vibration to oscillation. Two mechanical languages, one unified breath. Driving this exceptional creation, the fully skeletonised, hand-wound HMC 909 calibre reworks a traditional aesthetic into an understated and minimalist style, adding the final touch of elegance to this disruptive new piece.

H. Moser & Cie.'s own and unique take on Haute Horlogerie.

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