“Only Watch 2023” - Ferdinand Berthoud Chronomètre FB 3

The Chronomètre FB 3 “Only Watch” is a truly unique timepiece, a testament to the artistry and precision that Ferdinand Berthoud embodies. Crafted in a one-of-a-kind patinated bronze case, this watch pays homage to the patina that naturally develops on copper alloys, reminiscent of the precision instruments crafted by Berthoud himself in the 18th century. This patina is not just a visual element; it symbolizes the passage of time and marks the 270th anniversary of Ferdinand Berthoud receiving the title of 'Master Watchmaker' at the remarkably young age of 26.

What truly sets the FB 3 "Only Watch" apart is the caliber within - the only one in the world to feature a cylindrical balance-spring that is officially chronometer-certified by the COSC (Contrôle Officiel Suisse des Chronomètres). This is a fitting tribute to Ferdinand Berthoud's unwavering dedication to precision timekeeping.

Creating this exceptional timepiece required extensive research, testing, and meticulous adjustments to determine the ideal number of coils and the geometry of the terminal curve at the attachment points. The unique design of the watch also allows for a captivating view of the regulating organ at 9 o'clock, where the cylindrical balance-spring beats gracefully throughout the impressive three-day power reserve. To further showcase this remarkable feature, a large porthole has been incorporated into the case middle at the same location.

Photo credit: Ferdinand Berthoud