Ferdinand Berthoud Chronomètre FB 3SPC: Precision in 18K Rose Gold
The Chronomètre FB 3SPC is Ferdinand Berthoud’s lightest and thinnest wristwatch to date. Its design draws inspiration from Louis Berthoud’s No. 26 pocket watch from 1793. What makes it truly remarkable is the incorporation of a newly developed cylindrical hairspring, which dramatically enhances the movement’s precision and stability. 
Exquisite Craftsmanship: 18K Rose Gold and Transparent Sapphire
The 42 mm case, crafted in 18 K rose gold, measures only 9.43 mm thick and features a refined alternation of polished and satin-brushed finishes. A transparent sapphire “porthole” on the case flank at 9 o’clock offers a unique side view of the movement’s intricate architecture and operation. 
Revolutionary Cylindrical Hairspring: Precision Redefined
The cylindrical hairspring provides far greater precision and isochronism than a conventional flat hairspring. This rare component must be individually shaped and adjusted by hand, requiring an exceptional degree of skill. The escapement at 9 o’clock is equipped for the first time with this groundbreaking technology. 
Hand-Wound Movement with 72-Hour Power Reserve
Powering the watch is the FB-SPC hand-wound movement, beating at 21,600 vph and delivering a 72-hour power reserve. The movement is composed of 230 components and requires more than 100 hours of polishing and finishing. For more details, visit the Official Ferdinand Berthoud Website.
Price and Specifications
The retail price is CHF 140,000. 
Ferdinand Berthoud Chronomètre FB 3SPC Cylindrical Hairspring Watch Case: 18 K rose gold, 42.3 mm × 9.43 mm Crown: 18 K rose gold Crystal: Sapphire Dial: Rhodium-plated, open-worked Hands: 18 K rose gold Movement: FB-SPC hand-wound, 47 jewels, 21,600 vph, 72-hour power reserve Strap: Alligator leather, pin buckle Water resistance: 30 m
