Chronographs with a calendar and bezel adjustment

The golden age of the chronograph with a calendar function was in the late 1940s. In 1948, for example, two chronograph movement manufacturers within the Ebauches SA trust—Venus and Landeron—introduced 13 new calibers with a calendar function, followed by 10 more in 1950.

Landeron offered an original way to adjust the calendar functions: a mechanism controlled by a rotating bezel, which eliminated the unsightly small pushers around the edge of the case.

To learn more about these amazing calibers, click here.