Cased verge watch, French, c 1650.
© Science Museum / Science & Society Picture Library
Made by David Lestourgeon in Rouen, France, this watch is typical of those made in France and England shortly before the introduction of the balance-spring to control timekeeping. The watch has a single hour-hand and the spaces between the hours are divided into quarters. It is provided with an outer case decorated with pinwork. As with all early watches, the timekeeping is controlled by a verge escapement.