At 40mm, the Oyster case is crafted from 18kt yellow gold and features a monobloc middle case, screw-down case back, and a screw-down winding crown secured by the Triplock triple waterproofness system, delivering water resistance to 100 metres. The black monobloc Cerachrom bezel in ceramic carries a moulded tachymetric scale, while a scratch-resistant sapphire crystal protects the dial beneath.
The golden dial presents black counter rings alongside a Chromalight display offering long-lasting blue luminescence for low-light legibility. Power comes from Calibre 4131, a COSC-certified perpetual mechanical self-winding chronograph movement with a paramagnetic blue Parachrom hairspring, Paraflex shock absorbers, bidirectional winding via Perpetual rotor, and a power reserve of approximately 72 hours. Chronograph functions include a centre seconds hand, a 30-minute counter at 3 o'clock, and a 12-hour counter at 9 o'clock, with stop seconds for precise time setting.
The Oysterflex band is constructed from flexible metal blades overmoulded with high-performance elastomer and fastens with a folding Oysterlock safety clasp incorporating the Rolex Glidelock extension system for on-the-fly adjustability.
