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![M136660-0004-on-wrist](/assets/rolex/model_page/watch_assets_on_wrist/landscape_assets/m136660-0004_modelpage_on_wrist_landscape.jpg)
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REFERENCE
136660
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MODEL CASE
Oyster, 44 mm, Oystersteel
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BEZEL
Unidirectional rotatable 60-minute graduated, scratch-resistant Cerachrom insert in ceramic, numerals and graduations coated in platinum
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WATER RESISTANCE
Waterproof to 3,900 metres / 12,800 feet, helium escape valve
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MOVEMENT
Perpetual, mechanical, self-winding
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CALIBRE
3235, Manufacture Rolex
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POWER RESERVE
Approximately 70 hours
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BRACELET
Oyster, three-piece solid links
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DIAL
Intense black
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CERTIFICATION
Superlative Chronometer (COSC + Rolex certification after casing)
![Ceramic Bezel and Luminescent Display Ceramic Bezel and Luminescent Display](/assets/rolex/model_page/model_feature_assets/ceramic_bezel_and_luminescent_display-oystersteel-m136660-0004.jpeg)
Ceramic Bezel and Luminescent Display
The 60-minute graduated, unidirectional rotatable bezel of the Rolex Deepsea enables divers to precisely and safely monitor their dive and decompression times. It is equipped with a patented black Cerachrom bezel insert manufactured by Rolex in a virtually scratchproof ceramic whose colour is unaffected by ultraviolet rays. The graduation is coated via PVD (Physical Vapour Deposition) with a thin layer of platinum. The sleek black dial features large Chromalight hour markers and hands, filled with luminescent material that emits a long-lasting blue glow for excellent legibility in dark conditions.
![Black dial Black dial](/assets/rolex/model_page/model_feature_assets/black_dial-oystersteel-m136660-0004.jpeg)
Black dial
The dial’s luminescent Chromalight display is an innovation that improved visibility in dark environments, an essential feature for divers. Hour markers in simple shapes – triangles, circles, rectangles – and broad hour and minute hands enable instant and reliable reading to prevent any risk of confusion underwater.