Chronomètre FB 2RSM.2-1


A regulator with deadbeat seconds

Carousel image
Carousel image

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 rose gold and18-carat rose gold satin-finish dial with black rhodium 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 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.


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.


    • Material : Case in ethical 18-carat rose gold
    • Case Type : Round fitted with a transparent sapphire “porthole”
    • Diameter : 44 MM
    • Thickness : 14.30 MM
    • Water resistance : 30M
    • Glass : Domed, arched sapphire crystal, glareproofed on both sides
    • Case-back : Screw-in with glareproofed sapphire crystal
    • Crown type : 18-carat rose gold dynamometric crown 
    • 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 black rhodium treatment
    • Gilded steel fixed hours pointer
    • Facetted and skeletonised dagger-shaped minutes hand in 18-carat rose gold
    • Gilded central seconds hand in titanium
    • 18-carat white 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 rose gold pin buckle