Description: Gilt brass, front wound movement of early ‘onion’ single handed type. Big four armed steel balance lacking balance spring and balance cock. small silver regulator and verge escapement. Back plate signed ‘François Lachis’. Long round baluster pillars. Lacking chain, dial and dial plate. Motion work for single hour hand present.
Additional Info:
Jean – François Lachis (30.9.1627 – 4.11.1699) was apprentice of Jean Rousseau, of whom he married one of his daughters Clermonde Rousseau in 1657. He was also, together with Jean Rousseau, the master of David Rousseau, Jean’s son who continued the fathers business in Geneva.
The biggest collection of over twenty watches with movements made by the Rousseau family can be admired in the Patek Philippe Museum in Geneva.
Antiquarian Horology 
