Audemars Piguet 2864

The Audemars Piguet caliber 2864 is an in-house automatic movement featuring a perpetual calendar complication. Part of the 28xx caliber family, it represents the manufacture's traditional approach to combining calendar functions with automatic winding. The movement is discontinued, having been succeeded by newer perpetual calendar calibers in the brand's current collection. Notable references using this caliber include the Royal Oak perpetual calendar variants from the late 1990s and early 2000s.