Audemars Piguet 2121

The AP 2121 is an automatic movement introduced in 1972 as the original caliber for the Royal Oak. Measuring just 3.05mm in thickness, it is based on the Jaeger-LeCoultre 920 and offers a 40-hour power reserve with 36 jewels. While not manufactured in-house by Audemars Piguet, the movement powered the landmark Royal Oak ref. 5402 and remains historically significant as the first movement designed for Gerald Genta's iconic integrated-bracelet watch. Production has been discontinued.