Audemars Piguet Royal Oak Perpetual Calendar Ref. 25636PT

Introduced in 1972, the Royal Oak redefined the idea of the high-end sports watch and became a cultural icon in the process. Eleven years later Audemars Piguet took a further decisive step, presenting the first Royal Oak with perpetual calendar — the beginning of one of the most sophisticated interpretations of this complication in the history of watchmaking.

Reference 25636PT is one of the highest expressions of that evolution. Produced in a limited series and executed entirely in platinum, case and integrated bracelet alike, it unites rarity, technical complexity and an unmistakable presence on the wrist. Gérald Genta's celebrated octagonal case with its eight visible screws finds here one of its most exclusive versions, heightened by the weight and luminosity of the precious metal. Among the model's most distinctive features is the transparent sapphire dial, a choice that places aesthetics and mechanics in direct dialogue: grey indices and darkened gold hands create a restrained contrast, while the layout carries the full perpetual calendar indications — day, date, month, leap year and astronomical moon phases with the age of the moon.

Inside beats the ultra-thin automatic calibre 2120/2802, among Audemars Piguet's most respected movements for its reliability and for its ability to integrate so advanced a complication while preserving elegant proportions — a technical balance that made the Royal Oak Perpetual Calendar a genuine platform for experimentation within the maison. Complete with its original box and warranty, the example presents in excellent condition, confirming its standing among the references most sought after by collectors of complicated, rare watches with a strong identity.