Chronométrie Ferdinand Berthoud Chronomètre FB RES presented at Watches and Wonders 2024

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Chronométrie Ferdinand Berthoud…. Each wheel, bridge and screw is entirely hand-decorated. An extraordinary level of manual finishing has been applied in order to reveal the beauty of each component. Placed end to end, all the angles of the wheels and their bridges, as well as those revealed at the heart of the 9 o'clock power-reserve display, represent more than two linear metres filed and polished by hand. The finishing of the bridges and mainplate is specific to this new model named FB RES – standing in French for "Remontoir d’Égalité Squelette”.
38 personalised calibres

Peak precision
At the heart of this timepiece beats the Calibre FB-RES.FC, regulated by fusee-and-chain transmission and a one-second remontoire. The purpose of this full-fledged chronometric complication is to even out the energy coming from the barrel and transmitted to the escapement. The device relies on a spring positioned between the two organs. It temporarily stores a small amount of energy, which is then delivered to the balance. The charge/discharge frequency of this buffer energy is very short: one second. It is this sequential impulse that the large central seconds hand beats off, connected to the “remontoir d’égalité” via an intermediate wheel. It therefore advances in one-second jumps: this is a true-beat mechanism also known as a deadbeat second and generated directly by the remontoire. All these mechanical intricacies are almost entirely visible through the back of the FB RES.

CASE

• Dynamometric crown (decoupling system)
• Case-back fitted with a “chevee” sapphire crystal pane glare-proofed on both sides.
• Domed “chevee” sapphire crystal glare-proofed on both sides

DIAL

• Openworked nickel silver decorative plate topping the mainplate (dial):
Possible finishes: vertical satin-brushed or sandblasted
Possible colours: champagne-toned, anthracite or blue
• Circular satin-brushed seconds inner bezel ring surrounding the dial
Possible colours: champagne-toned, anthracite or silver-toned
• Mirror-polished stainless-steel gear-train bridges between 3 and 6 o’clock
• Power-reserve indication with “0_1” engraving on a 9 o’clock bridge visible on the dial side

HANDS

• Dagger-shaped hours and minutes hands in 18-carat gold
• Central sweep-seconds hand in brass
• Arrow-shaped power-reserve hand in 18-carat gold

STRAP AND BUCKLE

• Hand-sewn leather strap (125 x 70 mm, with a 20 mm buckle) – Various sizes available on request
• Length-adjustable double-blade folding clasp – Pin buckle available on request

FUNCTIONS

• Hours and minutes, deadbeat seconds, power reserve, time-setting with stop-seconds device on the balance

MOVEMENT

• Calibre FB-RES.FC: mechanical manual-winding movement, constant force with fusee-and-chain transmission and one-second remontoire
Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37.30 mm
Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.37 mm
Lignes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16 ½
Jewels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18,000 vph (2.5 Hz)
Power reserve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 hours

TECHNICAL CHARACTERISTICS     

• Constant force with fusee-and-chain transmission
       Inverted and suspended fusee – differential winding system (PATENT)
       Suspended barrel – Maltese cross stopwork system
• Regulating organ
       Two-arm variable-inertia Ferdinand Berthoud balance wheel fitted with 4 integrated adjustment screws
       Balance-spring with hand-crafted Phillips outer terminal curve (steel alloy)
       Swiss lever escapement
       15-toothed escape-wheel
• “Remontoir d’égalité” mechanism
       One-second winding
       Three-toothed stop wheel
       Triple-sided cam in hand-crafted synthetic ruby
Flat spiral spring (steel alloy)

Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200 (including the chain)
Chain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 790 components
Chain length      . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285 mm
Bridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Pillars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

DECORATIONS
• Nickel silver bridges fitted on stylised stainless-steel pillars, decorated according to dial design
• Hand-finishing according to the highest watchmaking standards

Officially chronometer-certified by the COSC

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