Verge watch in silver inner case, by Jas Shearwood. London, c 1759.
© Science Museum / Science & Society Picture Library
This watch by Jas Shearwood is in a silver inner case with a shagreen outer case, hall marked 1759. The watch has a silver dial and calendar. As with most early watches, the timekeeping is controlled by a verge escapement. Only the wealthy could afford pocket watches in the 18th century. They were the most intricate mechanical devices made for sale and represented the highest quality of mechanical work then performed.