Property of an important Hong Kong Collector

The present timepiece is a platinum, diamond-set, skeletonised perpetual calendar by Audemars Piguet — Reference 25670PT — belonging to a small series of round-cased platinum skeletonised perpetual calendars the manufacture began in 1987 with the Reference 25592PT. Possibly only nine examples are believed to have been produced in platinum. Consigned by its original owner, who acquired the watch in Hong Kong and has preserved it ever since, it is offered with its original certificate and presentation box. The case bevels remain crisp, and every hallmark and engraving i s exceptionally sharp.

At its heart beats calibre 2120/2800, developed from 1978 at Audemars Piguet in the depths of the quartz crisis. At 3.95mm it remains the thinnest self-winding perpetual calendar movement of its time. In the mid-1980s, AudemarsPiguet skeletonised it — turning a hidden mechanism into a visible argument against the invisibility of quartz.
The 25670PT belongs to the mature phase of that argument. Platinum anchors it in the rarest of metals; diamonds at thebezel and hour markers frame the skeletonized calibre beneath; the exposed movement declares the craft it took half acentury to defend. It stands among the rarest perpetual calendars Audemars Piguet has ever produced.