Audemars Piguet Royal Oak Perpetual Calendar Openworked 41mm Titanium and BMG

The Audemars Piguet Royal Oak Perpetual Calendar Openworked 41mm combines the collection's octagonal case with a skeletonised dial, leaving the calendar displays and movement visible rather than covered by a solid dial. Titanium forms the case and bracelet, while the bezel is made of BMG, or bulk metallic glass. Produced in 2025 and supplied new with its original box and papers, it is aimed at collectors interested in the Royal Oak line and in a perpetual calendar whose mechanism remains on view.

Because the dial is openworked, the calendar indications sit within the movement structure instead of on a separate dial plate, so reading them means looking into the mechanism itself. The octagonal case and integrated bracelet follow the Royal Oak's established geometry, and the bracelet continues in the same titanium as the case. A sapphire crystal covers the dial, and the automatic movement winds through normal wear rather than by hand. The 41mm case measurement is the relevant figure for comparing the watch with other Royal Oak references.

Technical Specifications:

• Case and bracelet material: Titanium
• Bezel material: BMG (bulk metallic glass)
• Case size: 41mm
• Movement: Automatic
• Crystal: Sapphire
• Water resistance: 2 ATM
• Scope of delivery: Original box and original papers
• Year of production: 2025