Perpetual calendars are the authoritative complications of calendar watches. When Audemars Piguet
created the Quantieme Perpetual Automatique
in the late 70s, perpetual calendars were scarce. Upon its release in 1978, the Quantieme Perpetual
represented one of the most significant horological innovations of the period - introducing the world’s thinnest, self-winding perpetual calendar movement
. It achieved its ultra-slim profile (3.95 mm) by adapting the renowned calibre 2120
movement, launched in ’67.