Chronomètre FB 1R.6-1

Availability: See the Chronomètre FB 1R.6-1 at 430 Park Avenue, NYC

• Limited Edition: 20-piece limited edition in carburized steel.
• Case: Octagonal case in carburised stainless steel fitted with two watertight portholes in glare proofed sapphire crystal
• Size: 44 x 13.95 mm
• Movement: Mechanical hand-wound Calibre FB-T.FC.R
• Function: Tourbillon, Officially chronometer-certified by the COSC
• Water Resistance: 30 m
• Dial: Black rhodium-plated nickel silver regulator plate (dial) satin-brushed by hand
• Hands: Dagger-shaped facetted and open worked minutes hand in 18-carat white gold with blue CVD coating. Steel fixed hour-marker with blue CVD coating
• Strap/Bracelet: Hand-sewn rolled-edge alligator leather strap with Titanium double-blade length-adjustable safety folding clasp

The construction and the regulator-type display of the Chronomètre FB 1R.6-1 was inspired by the Marine Clock No. 7 that Ferdinand Berthoud produced in 1767. 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 center seconds tourbillon whose constant force is provided by a fusee-and-chain transmission mechanism incorporating a satellite differential gear and Malte Cross stop work device. 

The case of the Chronomètre FB 1R.6-1 is made of a new material: carburized stainless steel, a steel whose molecular structure has been reinforced by a thermochemical process. 

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 open working 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 guarantee the concentric deployment of the balance-spring coils in all states of winding and unwinding.

This COSC-certified timepiece is available as a 20-piece limited edition in carburized steel.