AP 2120 / 2802

About the Audemars Piguet AP 2120 / 2802

The 2121 is the same base with a date; the 2120 has none, and the 2802 module on top carries the day, date, month, leap year and moon phase, with the moon printed on sapphire. The result is 28.4 mm across with 38 jewels, a 40-hour reserve and a beat of 21,600 vph, and it powered the Royal Oak Perpetual Calendar, the first Royal Oak with a complication, from the 25554 of 1984 through the 25820 and 26252 until the 5134 replaced it in 2015. The bridges are bevelled, brushed and engraved by hand. The glossary defines the perpetual calendar.

In the library it powers 14 Royal Oak Perpetual Calendar references at 39 mm and 4 Jules Audemars at 41 mm. 2 are limited editions.