Audemars Piguet 25558BA QP Skeleton Archives 1986

Audemars Piguet Pepetual Calendar (QP), Skeleton, 18K yellow gold
Serial: N 84 / C3628 / Mvt 227082
Circa: 1986
Reference: 25558BA

DIAL: Transparent mineral crystal with grey colored registers

CASE: 36mm, 18K yellow gold, 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 yellow gold ardillon buckle

CONDITION REPORT: The watch case and buckle are in overall worn, but unplolished condition with all serials and hallmarks still clearly visible. The watch is running well and all functions working properly. The dial appears to be from the mid 1990's with the large Audemars Piguet logo and is flawless without any cracks or marks.

NOTES: The watch comes with digital archives extract as well as a photo printed copy.

The Audemars Piguet ref. 25558 (same model as the previous reference 5558) is the skeletonized version of the brand’s famous ultra-thin perpetual calendar introduced in the late 1970s, during the Quartz Crisis. Using the legendary Calibre 2120/2800, it combined a full perpetual calendar with an exceptionally thin automatic movement.
What made the 25558 special was its hand-openworked construction: the movement bridges were carefully skeletonized and engraved, turning the mechanism itself into the dial. Produced in very small numbers, usually in yellow gold or platinum, the 25558 became one of AP’s most collectible vintage complications.
The watch helped preserve traditional Swiss high watchmaking at a time when mechanical watches were under serious pressure from quartz technology, and it paved the way for later Audemars Piguet perpetual calendar masterpieces.