
An automatic caliber supplied as an ebauche to Patek Philippe, Vacheron Constantin, and Audemars Piguet, though never utilized by JLC. It corresponds to Patek Philippe calibers 28-255 and 28-255 C, Vacheron Constantin calibers 1120, 1121, and 1122, and Audemars Piguet calibers 2120, 2121, and 2122.
No watches found with this movement