TAG Heuer Carrera “Tête de Vipère” Chronograph Tourbillon Chronometer
The “Tête de Vipère” stamp was applied to a chronometer for the first time by the Besançon Observatory in 1897. It’s intended as the mark of the unrivaled precision and excellence of a watch. Abandoned in the 1970s, then relaunched in 2006, the “Tête de Vipère” stamp has since been awarded to just 500 pieces.
READ MORE HERE TAG Heuer Carrera "Tête de Vipère" Chronograph Tourbillon Chronometer - watchuseek.com