Pivoted detent escapement watch by John Arnold in a silver-gilt case with monogram ‘C.M.’ surrounded by chiselled wreaths. White enamel dial with a subsidiary seconds dial and steel hands. Pivoted detent s-shaped balance and helical balance spring. Signed ‘John Arnold Invt. et Fecit No. 28’.

London, hallmarked 1776-7

This is the earliest recorded and surviving pocket watch by Arnold with his pivoted detent escapement. The s-balance is a slightly later addition, being of the type employed by Arnold from 1779-82.

Clockmakers Museum No. 419