Last Model Equipped with Calibre 5135... Commemorative Watch Combining Tradition and Innovation

Swiss luxury watch manufacturer Audemars Piguet unveiled "Royal Oak Perpetual Calendar Openworked 150th Anniversary" limited edition commemorating the brand enduring spirit of design, material, and technical exploration. This model is the last watch equipped with Calibre 5135 -- bidding an elegant farewell to the movement that served as the core power source of Audemars Piguet 41mm openworked self-winding perpetual calendar wristwatches for nearly a decade. This watch combining titanium and Bulk Metallic Glass (BMG) features design codes specially developed for the 150th anniversary. A total of only 150 pieces of this limited edition combining classic watchmaking tradition and cutting-edge technology will be produced. The openworked design significance: in watchmaking, "openworked" (or skeletonized) dials and movements remove material to reveal the movement mechanism beneath -- combining visual complexity with technical demonstration; the Calibre 5135 perpetual calendar mechanism tracking dates across different month lengths without manual adjustment is visible through the openworked display; BMG (Bulk Metallic Glass) is an amorphous metal alloy that combines extreme hardness with glass-like properties -- used in watch components for scratch resistance and unique aesthetic properties; the titanium case reduces weight despite the complex movement.