Chronomètre FB 1R.6-1


Avant-garde and timeless

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Inspired by the Marine Clock No. 7 that Ferdinand Berthoud produced in 1767, the construction and the regulator-type display of the Chronomètre FB 1R.6-1 overturn traditions. Composed of the rear side of the black rhodium-plated nickel silver regulator plate adorned with straight-grained lines, the dial features three openings: one for the hours (at 2 o’clock), another for the minutes (at 12 o’clock) and a third for the power reserve (at 10 o’clock). The Calibre FB-T.FC.R, with its pillar-type architecture, features a direct-drive centre seconds tourbillon whose constant force is provided by a fusee-and-chain transmission mechanism incorporating a satellite differential gear and Malte Cross stopwork device. Continuing the tradition of precision inherited from Ferdinand Berthoud, this COSC-certified timepiece is available as a 20-piece limited edition in carburised steel.



The case of the Chronomètre FB 1R.6-1 is made of a new material: carburised stainless steel, a steel whose molecular structure has been reinforced by a thermochemical process. Its exceptional hardness of 1'200 Vickers on the surface makes it extremely resistant, particularly to corrosion.


Based on an unprecedented design, the barrel and fusee of the FB-T.FC.R calibre are reversed and suspended, thereby saving precious millimetres within the movement. They are connected by a chain comprising no less than 474 steel links for a total length of 280 mm. When the movement is fully wound, the tension on the chain is equivalent to three kilograms.


Visible through the openworking of the half-bridge on the case-back side, the power-reserve indication device consists of a mobile cone and a set of flat levers on the dial side. This highly sophisticated mechanism is the result of complex mathematical calculations that guarantee the concentric deployment of the balance-spring coils in all states of winding and unwinding.


    • Material : Octagonal case in carburised stainless steel fitted with two watertight portholes in glareproofed sapphire crystal
    • Diameter : 44 MM
    • Thickness : 13.95 MM
    • Water resistance : 30M
    • Glass : Domed, arched and glareproofed sapphire crystal
    • Crown type : Dynamometric crown in carburised stainless steel with black ceramic medallion
    • Screw-in case-back with glareproofed sapphire crystal
    • 20-piece limited and numbered edition
    • Calibre : FB-T.FC.R
    • Type Of Movement : Mechanical hand-wound movement
    • Type Of Winding : Tourbillon with constant force device with fusee-and-chain transmission
    • Diameter : 35.5 MM
    • Тhickness : 9.89 MM
    • Lines : 15 ¾
    • Number of jewels : 49
    • Frequency : 21'600 A/h (3 Hz)
    • Power reserve : 53 hours
    • Number of components : 1158
    • Chain length : 285 MM
    • Certification : Chronometer-certified by the COSC
Dial and Hands
    • Dial : Black rhodium-plated nickel silver regulator plate (dial) satin-brushed by hand
    • Steel fixed hour-marker with blue CVD coating
    • Steel gold plated power-reserve hand
    • Bronze gold plated seconds hand
Functions and Display
    • Hours display on a sapphire disc at 2 o'clock
    • Minutes display at 12 o'clock
    • Central seconds
    • Power-reserve at 10 o'clock
Strap and Buckle
    • Strap : Hand-sewn rolled-edge alligator leather strap
    • Buckle : Titanium double-blade length-adjustable safety folding clasp