Chronomètre FB 1R.6-1

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Chronomètre FB 1R.6-1

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Avant-garde and timeless

Inspired by the Marine Chronometer No. 7 that Ferdinand Berthoud produced in 1767, the construction and the regulator-type display of the FERDINAND BERTHOUD FB 1R.6-1 chronometer 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 FB-T.FC.R calibre, 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.

Features

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The case of the Chronomètre FERDINAND BERTHOUD 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.
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Based on an unprecedented design, the barrel and fusee of the FB-T.FC.R calibre are 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.
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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 spiral-spring coils in all states of winding and unwinding.

Chronomètre FB 1R.6-1 in details

Case
Case
    • Diameter: 44 mm
    • Thickness: 13.95 mm
    • Water resistance: 30 m
    • Dynamometric crown in carburised stainless steel with black ceramic medallion
    • Octagonal case in carburised stainless steel fitted with two watertight portholes in glareproofed sapphire crystal
    • Screw-in case-back with glareproofed sapphire crystal
    • Domed, arched and glareproofed sapphire crystal
    • 20-piece limited and numbered edition
Movement
    • CALIBRE FB-T.FC.R
    • Mechanical hand-wound movement
    • Tourbillon with constant force device with fusee-and-chain transmission
    • Diameter: 35.50 mm
    • Thickness: 9.89 mm
    • Lines: 15 ¾
    • Number of jewels: 49
    • Frequency: 21,600 vph (3 Hz)
    • Power reserve: 53 hours
    • Number or parts: 1158
    • Chain length: 285 mm
    • Chronometer-Certified by the COSC
Dial and hands
    • Black rhodium-plated nickel silver regulator plate (dial) satin-brushed by hand
    • 18-carat blued (CVD) gold minutes 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
    • Hand-sewn rolled-edge alligator leather strap
    • Titanium double-blade length-adjustable safety folding clasp
Chronomètre FB 1R.6-1 Chronomètre FB 1R.6-1
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