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.

To obtain this certificate of excellence, each fully assembled watch undergoes a protocol involving 16 days of testing, in five different positions at three different temperatures.

Operating on behalf of the International Bureau of Weights and Measures, the Besançon Observatory is the only independent, public organization able to inspect chronometers. More than simply providing proof of quality and accuracy, this stamp is confirmation of technical expertise bordering on perfection. The stamp certifies the watch as a whole, not just the movement.


At Baselworld 2018, TAG Heuer unveiled a new version of the TAG Heuer Carrera Chronograph Tourbillon Chronometer featuring two complications: a tourbillon and a chronograph. The movement is housed in a midnight blue ceramic case, complemented by a ceramic bezel and lugs.

Touches of blue can also be seen in the weight and movement barrel. With its polished, brushed and bead-blasted finishes, the result is a sophisticated, modern piece, reflecting the highest quality Swiss watchmaking technology. The “Tête de Vipère” stamp has been applied to the bridge, visible through the sapphire crystal of the case back. The watch comes on a black alligator strap, sewn onto rubber with blue stitching.

How much?

The “Tête de Vipère” is a limited edition of 155 pieces and the watch will sell for $20,400.

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