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The Audemars Piguet "50th Anniversary" (Ref. 15510ST.OO.1320ST.05) commemorates half a century of the iconic Royal Oak with a refined monochromatic design. Housed in a 41 mm stainless steel case and finished with an integrated bracelet, this reference features a subtle grey Grande Tapisserie dial, paired with white gold hour markers and luminescent Royal Oak hands for clear reading and understated sophistication. A sapphire caseback reveals the next-gen self-winding movement and a commemorative 50th-anniversary rotor.