Chronomètre FB 1RSM.1-1

Reference# FB 1RSM.1-1
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    • Details
    • Description
    • Limited Edition: 20/20
    • Case: Hexagonal case in white gold, fitted with a transparent sapphire ‘porthole’
    • Size: 44 mm
    • Movement: hand-wound manufacture caliber FB-RE.FC, COSC-certified
    • Function: power reserve on back, deadbeat seconds, constant force- fusee-and-chain transmission, one-second remontoire
    • Power Reserve: approximately 53 hours
    • Water Resistance: 30 m
    • Dial: Openworked regulator ice blue plate satin-brushed and hand-engraved, Hours indication at 2 o’clock, Openworked minutes at 12 o'clock, Deadbeat seconds mechanism visible at 9 o'clock
    • Caseback: sapphire crystal
    • Hands: Facetted and skeletonised dagger-shaped minutes hand; Steel fixed hours pointer; Central seconds hand
    • Strap/Bracelet: alligator leather

    Chronomètre FB 1RSM.1-1:  a tourbillon regulator with fusee-and-chain transmission, incorporates an  independent deadbeat seconds visible on the dial side and a stop-seconds mechanism.

    The FB-T.FC-RSM calibre features a pillar-type architecture, in which both the barrel and the inverted fusee are suspended and patented. This fusee-and-chain mechanism is inspired by that of Ferdinand Berthoud’s marine chronometers. It ensures the distribution of energy by delivering ‘constant force’ to the patented tourbillon with direct-drive seconds.

    The Chronomètre FB 1RSM.1-1 offers a present-day take on the regulator-type principle. The hours are read off via a rotating disc at 2 o’clock; the minutes are indicated by a facetted and skeletonised hand on the subdial at 12 o’clock; and, as a symbol of precision, the seconds hand occupies a central position on the watch face.

    The “SM” letters added to the calibre reference pertain to the deadbeat seconds mechanism (seconde morte in French), while a balance-stop device enables the tourbillon to be stopped when setting the time to the exact second. The deadbeat seconds mechanism is visible through a special symbolically figure-eight-shaped aperture at 9 o’clock. 

    The 53-hour power reserve is visible from the back, close to the three key components of the FB-T.FC.RSM suspended movement: the fusee, the barrel and the tourbillon with direct-drive seconds.

     COSC chronometer certification.

    The creation of a deadbeat seconds mechanism is a major challenge for any watch that claims to earn chronometer certification. This is because stopping and restarting the central hand in one-second jumps involves three steps: stopping the gear train concerned; storing the torque it continues to produce during this pause; and then releasing it all at once after one second. Since the regularity of the torque is the essence of a constant-force calibre, interrupting its flow 60 times a minute without compromising its linearity is a true technical feat – which is why the majority of deadbeat seconds movements fail to achieve COSC certification. The Chronomètre FB 1RSM.1-1 has been awarded this certification and is therefore a true timekeeper, like the Marine Clocks by the Master Watchmaker himself.

    The Chronomètre FB 1RSM.1-1 design is inspired by the Marine Clock No. 8, known as H.M.8. dated 1768.  The dial is hand-engraved and bears the “No. 8” inscription like the original No. 8 Marine Clock, the inspiration for the FB RSM model. 

    Only 20 movements will be produced