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A compendium of horological and maritime history
Through its design and its COSC-certified movement with tourbillon and constant force, the 1785 edition of the FERDINAND BERTHOUD FB 1R Chronometer is inspired by Ferdinand Berthoud's Marine Chronometer No. 7. Integrated within a pillar-type architecture, the fusee and the barrel of the transmission system are suspended. The 280 mm long chain connecting them supports a tension of three kilos exerted once winding is complete. The result of complex scientific calculations, the power reserve consists of a unique mobile cone connected to flat levers on the dial side and reflects the main spring's various states of winding and unwinding with unparalleled precision. This exceptional timepiece is offered in a numbered five-piece limited edition, carved in bronze, each with a different patina to evoke the passage of time.

Features



Chronomètre FB 1R.5 in details

Movement
- CALIBRE FB-T.FC.R-2
- 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
- Regulator-display plate (dial) in hand satin-brushed natural nickel silver
- 18-carat blued (CVD) gold minutes hand
- Steel hour-marker with blue CVD coating
- Steel power-reserve hand with blue CVD coating
- Bronze blued (CVD) 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 pin buckle

