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The Audemars Piguet Royal Oak Selfwinding Chronograph 26450OR.OO.1356OR.01-B was introduced in 2026 as an update to the 38 mm Royal Oak Chronograph line first presented in 2019, marking the transition to a fully in-house chronograph movement. The watch is housed in a 38 mm case crafted from 18-carat pink gold with a thickness of 11.1 mm. Sapphire crystals are fitted on both the dial side and the caseback. Water resistance is rated to 50 metres. The integrated bracelet is executed in matching pink gold and secured by a three-blade folding clasp. The dial features a grey Grande Tapisserie pattern with beige chronograph counters. It is fitted with 18-carat pink-gold hands and hour markers filled with luminescent material, and framed by a pink-gold-toned inner bezel. The display includes hours, minutes, central seconds, a date indication, and chronograph registers. Powering the watch is the selfwinding Calibre 6401, visible through the sapphire caseback. The movement operates at a frequency of 28,800 vibrations per hour (4 Hz), consists of 350 components, contains 44 jewels, measures 27 mm in diameter with a thickness of 5.7 mm, and provides a power reserve of approximately 55 hours.