With its original regulator-type display and its ultra-resistant carburized stainless steel case, the Chronomètre FB-1R.6-1 enriches the Chronométrie Ferdinand Berthoud collection. This new presentation radically transforms an exceptional timepiece whose complications, together with the quality of its construction and production, remain true to their underlying philosophy. Its FB-T.FC.R tourbillon calibre with fusee-and-chain transmission can be admired through a sapphire crystal case-back and two lateral portholes, offering a unique view inside this outstanding chronometer.