Antiquorum Auctioneers since 1974

Important Modern & Vintage Timepieces

Hong Kong, Nov 28, 2026

LOT 126

AUDEMARS PIGUET, REF. 25554BA, ROYAL OAK PERPETUAL CALENDAR, 18K YELLOW GOLD

HKD 580,000 - 1,000,000

EUR 67,000 - 116,000 / CHF 61,000 - 106,000 / USD 74,000 - 128,000 / JPY 11,700,000 - 20,180,000

A very fine and rare, 18K yellow gold self-winding wristwatch with perpetual calendar and moonphases. This reference is the first Royal Oak perpetual calendar; approximately only 270 units are made.

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Grading System
Grade:
Case: 2-8

Very good

Slightly scratched
Movement: 2*

Very good

Overhaul recommended, at buyer's expense
Dial: 2-01

Very good

HANDS Original

Brand Audemars Piguet

Model Royal Oak Perpetual Calendar

Reference 25554BA

Year circa 1984-1992

Case No. C34322, No. 408

Bracelet AP 18K yellow gold bracelet with 18K white gold blades, total length approx. 185mm.

Caliber 2120/2800

Diameter 39mm.

Weight 174gr. (approx.)

Signature dial, case and movement

Notes

Antiquorum is proud to present the inaugural Royal Oak Perpetual Calendar, Reference 25554, launched at the 1984 Basel Fair. Powered by the ultra-thin Calibre 2120/2800, this reference achieves a remarkably slim 7.5 mm profile—an extraordinary technical feat considering it houses perpetual calendar and moon phase functions within the iconic Royal Oak case. With approximately 270 examples produced across all materials between 1984 and 1992, this reference remains exceptionally rare. The present lot is offered in excellent condition, retaining sharp, well-defined case proportions.