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The Audemars Piguet Royal Oak Selfwinding 15513BA.OO.1320BA.01 debuted in 2026 and is characterised by the use of an 18-carat yellow-gold case paired with a natural malachite stone dial. The watch is housed in a 41 mm case crafted from 18-carat yellow gold with a thickness of 10.5 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 yellow gold and secured by a three-blade folding clasp. The dial is manufactured from natural malachite, displaying banded stone patterns that vary between individual examples. It is fitted with 18-carat yellow-gold hands and hour markers filled with luminescent material and framed by a yellow-gold-toned inner bezel. The display is limited to hours, minutes, and central seconds. Powering the watch is the selfwinding Calibre 4309. The movement operates at a frequency of 28,800 vibrations per hour (4 Hz), consists of 225 components, contains 32 jewels, measures 32 mm in diameter with a thickness of 4.9 mm, and provides a power reserve of approximately 70 hours.