Lot 3207

Antique silver open face pocket watch by Tho Nadroy, London in 1812. It has a white enamel dial with Roman numerals and Arabic numbers. Comes with a brass pair case and a brass storage case. The hallmarks in the casing are lion passant for sterling silver, London assay office mark pre 1822 and a date letter from a second assay in 1846. The manual movement has a verge fusee. A verge fusee is a type of mechanical timekeeping mechanism that was commonly used in early clockmaking and watchmaking, particularly in the 17th and 18th centuries. The mechanism consists of two main components: the verge escapement and the fusee. Verge Escapement: This is one of the earliest types of escapements used in clocks and watches. The verge is a pivoted lever that oscillates back and forth, allowing the gear train to advance at a controlled rate. The motion of the verge escapement is regulated by a pendulum or a balance wheel. Fusee: The fusee is a conical-shaped pulley that is designed to compensate for the varying tension of the main spring as it unwinds. As the spring winds down, the fusee allows the movement to maintain a consistent force on the gear train, improving timekeeping accuracy. Together, the verge escapement and fusee create a reliable mechanism for timekeeping. - 40 mm, with pair case 47 mm. Glass missing. -