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Rolex Cosmograph Daytona 126518LN Yellow Gold Oysterflex Diamond Black Dial
The difference between Swiss grade and Asian grade watches lies in the material of the case used as well as the movement. Asian grade watches use 316L steel while Swiss grade watches are made with 904L steel which is more durable and rust and corrosion resistant. Swiss grade watches are made with replica machinery to match Swiss technology and standards so higher precision and finishing can be expected.
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Model case
Oyster, 40 mm, yellow gold
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Oyster architecture
Monobloc middle case, screw-down case back and winding crown
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Diameter
40 mm
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Material
18 ct yellow gold
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Bezel
Black monobloc Cerachrom bezel in ceramic with moulded tachymetric scale
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Winding crown
Screw-down, Triplock triple waterproofness system
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Crystal
Scratch-resistant sapphire
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Water resistance
Waterproof to 100 metres / 330 feet
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Movement
Perpetual, mechanical chronograph, self-winding
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Calibre
4131, manufacture Rolex
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Precision
-2/+2 sec/day, after casing
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Oscillator
Paramagnetic blue Parachrom hairspring. High-performance Paraflex shock absorbers
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Winding
Bidirectional self-winding via Perpetual rotor
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Power reserve
Approximately 72 hours
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