1924 - Self-winding wristwatch

Harwood's patent did not have a crown. The hand's setting and winding were perfomed by rotating bezel. The HARWOOD Automatic relied on on pawls and clockwork and pivoted oscillating weight that moved an arc of 270° hitting buffer springs on both sides  (so-called hammer automatic).

__________

Rok 1946 - Jaeger-LeCoultre  „bumper”.  

Jaeger-LeCoultre also built his own automatic bumper. He differed from Harwood's solution by, among other things, a crown used for setting hands (instead of a rotating bezel) and a wider angle of rotation of the rotor.

The caliber 476 is considered to be the prototype of modern movements from the Master Control collection of JLC. 



 

Application: Władysław Meller

Other records: Timeline of Watchmaking Innovations

ETERNA - KALENDARIUM

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