Spring-driven keyles stopwatch, 1890.
© Science Museum / Science & Society Picture Library
Made by William Williams of Bury, Lancashire, this 'keyles' watch is wound, and the hands are set, by turning the crown at the top. It has the usual minute and hour hands and a small seconds hand. It also has a centre seconds hand controlled by a 'stop' mechanism which is operated by a small lever on the side of the case.