Chronométre FB 2RS.2-1

Reference# FB 2RS.2-1
Manufacturer's retail price: $261,800
  • Details
  • Description
  • Limited Edition: 20 Pieces total for Calibre FB-T.FC.RS
  • Case: Round case in case and lugs in 18-Carat Rose Gold, fitted with two transparent sapphire portholes
  • Size: 44 mm
  • Movement: Tourbillon with fusée-chain transmission (constant force) Suspended fusée – winding differential system, Suspended barrel – Maltese cross stopwork system, Suspended power reserve – mobile cone system, Tourbillon with direct-drive seconds
  • Power Reserve: 53 hr
  • Water Resistance: 30 m
  • Dial: Openworked regulator plate (dial) in vertical satin-brushed BLUE PVD-treated nickel silver, Hours indication on sapphire disc at 2 o’clock , Open worked, sandblasted and silver-toned minutes dial at 12 o’clock, with black Arabic numerals, Flat seconds inner bezel ring framing the sapphire dial
  • Caseback: sapphire crystal, glare-proofed
  • Hands: Facetted and open worked dagger-type minutes hand in 18-carat white gold with blue CVD treatment, Steel fixed hours pointer with blue CVD treatment, Arrow-type power-reserve hand in 18-carat rose gold, Gilded bronze central sweep-seconds hand
  • Strap/Bracelet: Hand-sewn rolled-edge alligator leather strap made from a single piece of leather, 18-carat rose gold double-blade length-adjustable folding clasp – pin buckle available on request.


Only 20 examples of the new Régulateur Squelette movement will be produced and housed in a choice of round or octagonal cases. 

This unique piece has a Openworked regulator plate (dial) in vertical satin-brushed BLUE PVD-treated nickel silver, Hours indication on sapphire disc at 2 o’clock , Open worked, sandblasted and silver-toned minutes dial at 12 o’clock, with black Arabic numerals, and Flat seconds inner bezel ring framing the sapphire dial.

The calibre FB-T.FC-RS with tourbillon and fusee-and-chain transmission thus heralds a new approach for Chronométre Ferdinand Berthoud, enabling collectors to appreciate the rarity of precision mechanics while choosing the case design that suits them best.

The first skeleton movement

The FB-T.FC-RS calibre is the first skeleton movement produced by the Manufacture. This regulator-type chronometer movement with tourbillon and fusee-and-chain transmission is the result of comprehensive technical and aesthetic development and is inspired by Marine Clock No. 8, produced by the master-watchmaker in Paris in 1768. Through the opening visible at 2 o’clock, a large-diameter sapphire disc indicates the hours, while minutes are read off on the dial offset to 12 o’clock. The seconds are displayed on a flat sapphire inner bezel ring surrounding the dial.

The bridges have been entirely designed to ensure an admirable view of the choreography performed by the imposing tourbillon carriage appearing on the dial side. Many components feature black PVD coating, alternating with polished, matt, vertical satin-brushed and sandblasted finishes. The tourbillon bridge visible on the dial side is in itself a tour de force, with its mirror-polished and chamfered surfaces, polished flanks, and sandblasted underside. The decoration alone of each movement thus requires dozens of different craftsmanship skills. Nearly a year of trials was needed to achieve this level of finishing, enabling the complexity of this new movement on the dial side to be fully admired for the first time.

The FB-T.FC-RS calibre features a pillar-type structure in which the barrel and the reverse fusee are both suspended and patented. This fusee-and-chain transmission mechanism is inspired by that of Ferdinand Berthoud’s marine chronometers. It ensures the distribution of energy by delivering “constant force” to the tourbillon with its direct-drive seconds. This novel construction is the third patent to be filed.

Finally, the fourth patent applies to the power-reserve indicator. Visible on the case-back side, a suspended truncated cone moves up and down along an arbor connected to the barrel. A feeler spindle in the form of a mobile arm tipped with a watch jewel reflects the state of wind of the barrel thanks to its position on the cone. It transmits the information to the power-reserve hand on the dial side by means of flat levers and a spiral spring.

Like all Chronométre Ferdinand Berthoud movements, the FB-T.FC-RS calibre is officially chronometer-certified and was submitted to the Fleuritest during its development phase.

One movement, two cases

The choice of watch exterior – from among the various combinations offered by Chronométre Ferdinand Berthoud – will be left to the collector. Henceforth, the Manufacture will be offering two variations: the FB 1RS.6 with an octagonal case in carburised stainless steel and the FB 2RS.2 with a round case in 18-carat rose gold. This carburised steel has had its molecular structure reinforced, making its surface (1200 Vickers) extremely resistant to scratches and corrosion. The gold is of certified ethical origin.

This approach is in line with the quality-driven vision adopted since the start of the Manufacture in 2015. The two successive awards at the 2019 and 2020 editions of the Grand Prix d’Horlogerie de Genève in the “Chronometry” category have demonstrated the reliability and precision of its timepieces. Through this new initiative, Chronométre Ferdinand Berthoud thus confirms its desire to exceed collectors’ expectations by offering the unprecedented possibility of choosing the case shape.