Self winding wrist watch movement, Harwood, Switzerland.
The self-winding system was invented by John Harwood in 1923. It uses an oscillating weighted arm with two buffer springs. The wearer's movement causes the oscilllating arm to bump a ratchet that winds the watch.
Based on his patent, companies produced watches in Switzerland, France England and the USA, from the late 1920s to 1931. This movement was purchased by the museum directly from John Harwood in 1958.
Self-winding spring; lever escapement.
Type of item
0.6 cm (Width), 2.5 cm (Outside Diameter)