Audemars Piguet Royal Oak Perpetual Calendar "150th Anniversary", 26585XT.OO.1220XT.01, box and papers

Audemars Piguet brings a futuristic twist to a grand complication with this Royal Oak Perpetual Calendar "150th Anniversary" in titanium, featuring a stunning open sapphire dial. This ultra-modern timepiece seamlessly blends avant-garde design with high horology. The dial reveals intricate calendar indications including day, date, month, week number, leap year, and a beautifully rendered astronomical moon phase. Blue accents and luminescent bathtub hands enhance readability, while white gold markers add a refined touch. The integrated bracelet pairs titanium links with BMG (bulk metallic glass) studs, ensuring lightweight durability and cutting-edge aesthetics. This Royal Oak embodies both technical mastery and progressive design.

Technical Data
• Movement
– Caliber: AP Manufacture Calibre 5135
– Type: Selfwinding
– Functions: Hours, minutes, perpetual calendar (day, date, week, month, leap year), astronomical moon
– Power reserve: Approx. 40 hours
– Frequency: 2.75 Hz (19,800 vph)

• Case
– Material: Titanium
– Bezel: Fixed, octagonal titanium
– Crystal: Sapphire with anti-reflective coating
– Caseback: Sapphire, screw-down
– Water resistance: 20 m

• Dimensions
– Diameter: 41 mm
– Thickness: 9.5 mm
– Movement diameter: 29 mm
– Movement thickness: 4.5 mm

• Strap
– Type: Integrated bracelet
– Material: Titanium with BMG studs
– Buckle: AP folding clasp