At 40 mm, the Oyster case is constructed from Yellow Rolesor, Rolex's combination of Oystersteel and yellow gold, featuring a monobloc middle case, solid case back, and a screw-down winding crown equipped with the Triplock triple waterproofness system. The fixed yellow gold bezel carries an engraved tachymetric scale, while a scratch-resistant sapphire crystal and 100-metre water resistance round out the case's protective credentials.
The golden dial presents black counter rings and a Chromalight display with long-lasting blue luminescence for legibility in low light. The Oyster bracelet, built from three-piece solid links in Yellow Rolesor, secures with a folding Oysterlock safety clasp and includes an Easylink 5 mm comfort extension link.
Inside beats the self-winding Calibre 4131, a perpetual mechanical chronograph movement manufactured by Rolex, offering COSC-certified precision of -2/+2 seconds per day after casing and a power reserve of approximately 72 hours. The oscillator features a paramagnetic blue Parachrom hairspring and high-performance Paraflex shock absorbers, while the bidirectional Perpetual rotor keeps the watch wound during wear.
