Tourbillon sous trois Ponts d’or montre de poche

Caracteristics

Description

A real icon of both the Girard-Perregaux Brand and Swiss Haute Horlogerie, the pocket watch’s movement is distinctive not only in its construction, but also in its unrivalled finishes.

The Tourbillon cage is in the form of a lyre, which since the 1880s has been recognised throughout the watchmaking world as the signature of the Girard-Perregaux Brand. Its 92 components are produced, finished, assembled and adjusted with the precision and skill required for such small-scale work. As was commonly the case with high-quality watches in the 19th century, the model is equipped with a Guillaume-type bimetallic balance which compensates for variations in temperature to ensure greater rate precision.

Constant Girard-Perregaux equipped his Tourbillon with a pivoted detent escapement. This mechanism has, of course, been reused on this model, in spite of the difficulties its production and adjustment present: its total length is no more than 8.5 millimetres, and the gold detent spring has a thickness of just 0.04 millimetres.

The movement comprises a total of 249 components, which are pre-assembled, disassembled, adjusted, checked, dismantled and decorated, one by one, before being finally assembled. This magnificent architecture is the result of meticulous adjustment and numerous checks. As was customary in the 19th century, its operation was then checked by an independent external testing body, which awarded it the title of chronometer based on its exceptional results: the average rate variation over 15 days was no more than 0.1 second per day.