1924 - Self-winding wristwatch
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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
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