ROLEX YACHT-MASTER II Ref. 116680 904L Steel White Oyster, Cal. 4161, self-winding regatta chronograph

MODEL CASE
Oyster, 44 mm, steel
OYSTER ARCHITECTURE
Monobloc middle case, screw-down case back and winding crown
DIAMETER
44 mm

MATERIAL
904L steel
BEZEL
Bidirectional rotatable Ring Command bezel. Blue Cerachrom insert in ceramic, engraved numerals and inscription
WINDING CROWN
Screw-down, Triplock triple waterproofness system

CRYSTAL
Scratch-resistant sapphire

WATER-RESISTANCE
Waterproof to 100 metres / 330 feet

MOVEMENT
Perpetual, mechanical, self-winding, regatta chronograph

CALIBRE
4161, Manufacture Rolex
PRECISION
-2/+2 sec/day, after casing

FUNCTIONS
Centre hour and minute hands, small seconds hand at 6 o'clock. Programmable countdown with mechanical memory and on-the-fly synchronization. Stop-seconds for precise time setting

OSCILLATOR
Paramagnetic blue Parachrom hairspring
WINDING
Bidirectional self-winding via Perpetual rotor
POWER RESERVE
Approximately 72 hours
BRACELET
Oyster, flat three-piece links
BRACELET MATERIAL
904L steel
CLASP
Folding Oysterlock safety clasp with Easylink 5 mm comfort extension link

DIAL
White
DETAILS
Highly legible Chromalight display with long-lasting blue luminescence

CERTIFICATION
Superlative Chronometer (COSC + Rolex certification after casing)