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  • Technical
  • Astronomical indications
  • Tourbillon

FB 1L

Ferdinand Berthoud 2019

ref. FB 1L.4
Men's

With this COSC-certified chronometer, which brings together an in-house, fusee-chain tourbillon movement with a truly novel display of the age and phases of the moon, Ferdinand Berthoud again shows itself worthy of the master watchmaker's name as it carries on his quest for chronometric precision. Manufactured as a ten-piece limited edition, the standout feature has to be the display at 6 o'Clock, showing the age and phases of the moon by a hand moving back and forth with astronomical precision: a discrepancy of a single day after 577 years of continuous operation. A second innovation lies with the suspended fusee-chain construction that supplies constant force to the escapement throughout the 53 hours of power reserve. Not forgetting the tourbillon with central seconds, visible on the back of the sandblasted white gold case whose octagonal lines are accentuated by elements in ceramised titanium.

Function

  • Function
    Hours, Minutes, Seconds

Complications

  • Regulating mechanism
    Constant-force escapement
    Fusee mechanism
    Tourbillon
  • Display
    Power-reserve indicator
  • Astronomical indications
    Moon phases

Movement

  • Movement name
    Calibre FB-T.FC.L
  • Energy supply
    Manual-winding
  • N° of components
    1240
  • N° of jewels
    55
  • Power reserve
    53 hours
  • Vibrations
    21600
  • Form
    Round
  • Height/thickness
    9.38 mm
  • Diameter
    37.30 mm

Case

  • Form
    Other
  • Material
    White gold / ceramised titanium
  • Height/thickness
    13.95 mm
  • Maximum clear dimensions
    44.00 mm
  • Back
    Sapphire
  • Water-resistance
    30 m

Dial

  • Material
    Brass
  • Colour
    Black

Strap

  • Material
    Alligator leather
  • Colour
    Black
  • Fastening
    Folding clasp

Characteristics

  • Certifications
    COSC
  • Limited/numbered edition
    10