The Audemars Piguet Royal Oak Perpetual Calendar Openworked (Ref. 26685) features a titanium case and a metallized sapphire bezel. Measuring 41mm in diameter and 9.5mm in thickness, it is powered by the AP Calibre 7139 openworked perpetual calendar movement. Equipped with a "universal crown," the timepiece offers a power reserve of 55 hours and is water-resistant to 50 meters. With the introduction of the new-generation Calibre 7139 movement, the new Royal Oak Perpetual Calendar Openworked (Ref. 26685) features entirely redesigned openworked balance and mainspring bridges, significantly increasing the number of interior angles. Of the 200 interior angles present, 96 are located within the mainspring section. After utilizing Electrical Discharge Machining (EDM) to cut the openworked bridges, Audemars Piguet artisans spend 30 hours hand-polishing these interior angles. Set against the fully openworked movement, the solid gold openworked balance and mainspring bridges—along with the rotor bearing the AP logo—stand out as striking and luxurious elements.
The retail price of the Replica Audemars Piguet Royal Oak Perpetual Calendar Openworked (Ref. 26685) is nearly double that of the standard model (Ref. 26674); this premium in value is attributed almost entirely to the intricate openworking. The new-generation Royal Oak Perpetual Calendar Openworked (Ref. 26685) represents the "pinnacle" of Audemars Piguet's openworked perpetual calendar offerings, far surpassing its predecessor. While the previous generation featured only 60 interior angles, the new Calibre 26685 boasts 200. The sheer scale of the openworking and the exquisite quality of the finishing on this new Royal Oak Perpetual Calendar are simply incomparable to any previous openworked model in the series. Furthermore, by eliminating the traditional solid dial, the new Royal Oak Perpetual Calendar Openworked (Ref. 26685) gains another significant advantage: all the gears and levers governing the perpetual calendar mechanism are now fully visible from the dial side. Audemars Piguet's new-generation Calibre 7138/7139 perpetual calendar movements utilize a system combining standard perpetual calendar program wheels with an oversized operating lever. As I use the "Universal Crown" to switch between different settings and adjust the perpetual calendar, I can observe—through the dial at the 2 o'clock position—the interplay and movement of the program wheel and the large operating lever; this is a visual experience that simply cannot be found on other perpetual calendar watches.
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