They plan to have Dépraz develop and manufacture the chronograph mechanism to equip this calibre.īüren is in charge of the base calibre. They have an exclusive right to use this calibre. to build the blanks and the automatic movement of an automatic chronograph, the basic execution of which is designated by calibre No. The convention signed on February 2, 1966, between Dépraz & Co., Heuer-Léonidas SA and Léon Breitling SA. For confidentiality purposes, the development is code-named Project 99. The four-party Chronomatic consortium is born, including two rival brands teaming up to develop their own automatic chronograph. On February 2nd, 1966, an agreement is signed. In need of commercial partners, they manage to convince first Jack Heuer and then Willy Breitling to support the project. Dubois contacts Hans Kocher of Büren Watch Co. As Büren had pioneered the production of micro-rotor movements, Gérald Dubois (of Dépraz & Co., a chronograph specialist) figured out that these would be thin enough to be the base for a modular chronograph movement.

The history of the Calibre 11 starts at the end of 1965.

Calibre watches meaning