Crafted entirely in 18-carat yellow gold, this 37mm Royal Oak carries the hallmark octagonal case design that has defined the collection for decades. The yellow gold dial is rendered with a vertical satin finish, giving it a distinctive textured quality, while the matching yellow gold hands are fitted with a luminescent coating for legibility. An AP folding clasp secures the 18-carat yellow gold bracelet.
Inside, a selfwinding movement measures 26.2 mm in diameter and just 3.9 mm in thickness, operating at 4 Hz (28,800 vph) with a power reserve of 60 hours. The calibre comprises 174 parts and 29 jewels, delivering hours, minutes, centre seconds, and a date display. Water resistance is rated to 50 metres.
Reference 15550BA.OO.1356BA.02 represents a cohesive study in yellow gold, from case to bracelet to dial, offering the Royal Oak's architectural silhouette in an all-gold expression at a 37mm wearable scale.
