Rolex Datejust 278240-0001 31mm Black Roman Domed Bezel Oyster Oystersteel

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Rolex Datejust 278240-0001 31mm Black Roman Domed Bezel Oyster Bracelet Oystersteel Watch

Technical Specs:

Brand:Rolex
Model:Datejust 31
Reference Number:278240-0001
CASE
Case ShapeRound
Case Dimensions31 mm
Oyster ArchitectureMonobloc middle case, screw-down
case back and winding crown
CrystalScratch-resistant sapphire, Cyclops lens over the date
BezelDomed
Winding CrownScrew-down, Twinlock double waterproofness system
Water ResistanceWaterproof to 100 metres / 330 feet
Case MaterialOystersteel
DIAL
Dial ColorBlack
DetailsRoman Numerals
BRACELET
Band MaterialOystersteel
Band NameOyster, three-piece solid links
ClaspFolding Oysterclasp with Easylink 5 mm comfort extension link
MOVEMENT
Movement TypePerpetual, mechanical, self-winding
Calibre2236, Manufacture Rolex
Precision-2/+2 sec/day, after casing
FunctionsCentre hour, minute and seconds hands. Instantaneous date with rapid setting. Stop-seconds for precise time setting
OscillatorSyloxi hairspring in silicon with patented geometry. High-performance Paraflex shock absorbers
WindingBidirectional self-winding via Perpetual rotor
Power ReserveApproximately 55 hours
COSC CertifiedSuperlative Chronometer (COSC + Rolex certification after casing)