Chronomètre FB 2RSM.1


A regulator with deadbeat seconds

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The Chronomètre FB RSM reinterprets the architecture and design of the Marine Clock no. 8 produced by the master clockmaker in Paris in 1768. Only 20 movements will be produced, and several key exterior elements can be chosen by the collector. They may be fitted inside a round or octagonal case.

The FB 2RSM.1 with a round case in 18-carat white gold and a satin-finished 18-carat gold dial with blue CVD treatment is one of the variations offered by the manufacture.



Ferdinand Berthoud devoted his life to experimentation and to passing on his knowledge by publishing numerous specialised works and training apprentices. The Chronomètre FB RSM continues this tradition by enabling a young watchmaker from the University of Neuchâtel to participate in the development of the movement as part of his graduation project.


The FB-T.FC-RSM calibre features a pillar-type architecture, in which both the barrel and the inverted fusee are suspended and patented. His mechanism ensures the distribution of energy by delivering ‘constant force’ to the patented tourbillon with direct-drive seconds.


The creation of a deadbeat seconds mechanism is a major challenge for any watch that claims to earn chronometer certification. 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.


    • Material : Case in ethical 18-carat white gold
    • Case Type : Round with a transparent sapphire “porthole”
    • Diameter : 44 mm
    • Thickness : 14.30 mm
    • Water resistance : 30 m
    • Glass : Domed, arched sapphire crystal, glareproofed on both sides
    • Case-back : Screw-in with glareproofed sapphire crystal
    • Crown type : Dynamometric in 18-carat white gold with black ceramic medallion
    • Calibre : FB-T.FC.RSM
    • Type Of Movement : Tourbillon with constant force with fusée-chain transmission
    • Type Of Winding : Mechanical hand-wound movement
    • Diameter : 37.30 mm
    • Тhickness : 9.89 mm
    • Lines : 15 ¾
    • Number of jewels : 60
    • Frequency : 21'600 A/h (3 Hz)
    • Power reserve : 53 hours
    • Number of components : 1169
    • Chain length : 285 MM
    • Certification : Chronometer-certified by the COSC
    • Limited production (encompassing all types of case) : 20 movements
Dial and Hands
    • Dial : Vertical satin-brushed and hand-engraved 18-carat gold with blue CVD treatment
    • Steel fixed hours pointer
    • Facetted and skeletonised dagger-shaped minutes hand in 18-carat white gold
    • Central seconds hand in titanium
    • 18-carat gold power-reserve hand with blue CVD treatment
Functions and Display
    • Disc-type hours display at 2 o'clock
    • Minutes display at 12 o'clock
    • Deadbeat seconds in the centre
    • Power-reserve on the back of the movement
    • Stop-seconds device power reserve
Strap and Buckle
    • Strap : Hand-sewn rolled-edge alligator leather
    • Buckle : 18-carat white gold pin buckle

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