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When we think of Audemars Piguet nowadays, the first thing we think about is the Royal Oak. But that obscures AP’s distinguished history of producing beautifully finished and highly complicated watches. Audemars Piguet’s introduction of the ‘Quantième Perpétuel’ line of ultra-thin perpetual calendar wristwatches with an automatic movement in 1978 has been one the most significant innovations in watchmaking in the last 50 years.

This ref. 25661 is executed in a slim platinum case, measuring a classic 36 mm. The case features a lovely stepped bezel, elegant downturned lugs, and a small crown. The ref. 25661 was produced almost in parallel with the 25657, with the difference being the addition of a sapphire crystal caseback on the first mentioned. While both references were available simultaneously, the ref. 25661 is much rarer with a total production run of just 342 pieces -in different materials- and only 37 have ever been produced in the noblest of metal: platinum. The production run started in 1985 and continued for about a decade, in which numeral dials have been used. This white execution is the most understated of the bunch and features elegant painted 'Breguet' numerals, making it that much more rare. Combined with matching thin blue-hands as well as four beautiful recessed sub-dials that indicate the day, date, month, and phase of the moon.

The ‘Quantième Perpétuel line is powered by Audemars Piguet’s caliber 2120/2800 automatic movement, which is derived from Jaeger Lecoultre’s legendary ultra-thin caliber 920 base movement. This base movement was used, among others, in AP’s Royal Oak, Patek’s Nautilus, and Vacheron Constantin’s 222. For the QP line, Audemars Piguet reworked the caliber 920 to include a perpetual calendar complication as well as a 21k gold rotor.

This very late execution dates back to 1994 and is accompanied by the original certificate and combined with the necessary booklets and original winding-box. The watch is in excellent condition with spotless dial and all hallmarks and engravings are clearly visible. We’ve attached the watch to a beautiful matching blue alligator strap with AP buckle.