Audemars Piguet QP Skeleton 25592PT Diamond 1987

Audemars Piguet Pepetual Calendar (QP), Skeleton, Platinum, Diamond Bezel, Rare Reference 25592PT
Serial: No 004 / C18566 / Mvt 254054
Circa: 1987
Reference: 25592PT

DIAL: Transparent mineral crystal with blue grey colored registers and diamond hour markers

CASE: 36mm, Platinum, sapphire crystal on the front & on the back

MOVEMENT: Caliber 2120/2800, skeletonized automatic perpetual calendar, 38 jewels

BRACELET: Leather strap with Audemars Piguet 18k white gold ardillon buckle

CONDITION REPORT: Worn, mint condition, the case is unpolished and all hallmarks and numbers are ultra crisp.

NOTES: Audemars Piguet records confirm (digital archives extract provided) that this model was registered on March 18, 1987. It features a platinum case and is powered by the Caliber 2120/2800_SQ movement. Exact production numbers for the Reference 25592PT remain undocumented, adding to the intrigue surrounding this exceptionally rare timepiece.

The Reference 25592PT is crafted in platinum and exhibits a close design relationship with the Reference 25670PT, which research suggests was produced in extremely limited numbers—possibly as few as nine examples. Despite their similarities, four notable distinctions set the two references apart.

First, the 25592PT features a visibly larger case profile around the pusher area compared to the 25670PT. Second, examples of the 25592PT produced in 1987 display a single platinum hallmark, whereas the 25670PT, produced in 1993, bears three hallmarks. Third, the case back of the 25592PT differs subtly in hand-engraving style, engraving placement, case numbering, and signature positioning. Finally, the 25592PT displays an earlier form of the Audemars Piguet signature, offering a clear visual distinction from the more modern signature used on the 25670PT.

Considered an earlier production model, the Reference 25592PT is believed to be even rarer than the already elusive 25670PT. This particular example is especially significant, representing the first known appearance of a Reference 25592PT to surface publicly and at auction, marking a noteworthy horological discovery.

During the 1980s and 1990s, perpetual calendar watches represented the pinnacle of watchmaking achievement, reserved for the most discerning collectors. Produced during the industry’s recovery from the quartz crisis, the Audemars Piguet Reference 25592PT stands as an extraordinary platinum perpetual calendar. Previously undocumented in publications or online and known only through Audemars Piguet’s internal records, this model exemplifies the artistry, technical mastery, and exclusivity of high-end Swiss watchmaking.