the royal oak perpetual calendar openworked ref. 26585xt.oo.1220xt.01 debuted in 2025, marking 150th anniversary of audemars piguet, and the end of of caliber ap 5135 - which is dressed-up for the occasion, the 41 mm case combines a bezel and caseback frame in bmg (bulk metallic glass) with a titanium case middle and screw-locked crown.

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