The oldest known perpetual calendar in a pocket watch was constructed by Thomas Mudge in 1763. It had a mechanism with cylinder escapement. Is showed in The British Museum.
In 1889 Patek Philippe developed his own perpetual calendar for pocket watches. Essential and distinctive feature of which was the immediate and simultaneous change of day, date, month and phase of the moon.
Notifier: Tomasz Jakubas
Other records: Timeline of Watchmaking Innovations