AUDEMARS PIGUET. AN ELEGANT 18K GOLD AUTOMATIC PERPETUAL CALENDAR WRISTWATCH WITH MOON PHASES

At the time of its launch in 1978, reference 25657, the Quantième Perpétuel Automatique model, was one of the few perpetual calendar wristwatches available at the period. It incorporated furthermore one of the most important horological innovation of the time, the world’s thinnest, automatic perpetual calendar movement with an ultra-slim profile of only 3.95 mm., cal. 2120. The present example bears French import hallmarks on its case back.