Memento mori skull watch, known as the “Mary, Queen of Scots” watch. Place of origin: Blois, France. Date: c. 1780–1850 AD; movement signed “Moysant, Blois.” Medium: engraved and pierced silver; the jaw lifts to reveal the dial. Collection: The Worshipful Company of Clockmakers. Now on display at the Clockmakers’ Museum, Science Museum, London.