In 1783-85 Breguet designed for Prince Praslin one of the most complicated pocket timepieces with self-winding mechanism: Breguet No. 92 "Duc de Praslin". It had the following functions: perpetual calendar that indicated the current phase and age of the moon, the time equation, the dead second, power reserve indicator and the minute repetition.
Reported by: Tomasz Jakubas
Other records: Timeline of Watchmaking Innovations