134300-0004 - 41mm Oystersteel case, monobloc middle case with screw-down case back and winding crown, screw-down crown with Twinlock double waterproofness system, domed bezel, scratch-resistant sapphire crystal, green lacquer dial with highly legible Chromalight display with long-lasting blue luminescence, Rolex calibre 3230 perpetual self-winding movement with centre hour, minute and seconds hands, stop-seconds for precise time setting, paramagnetic blue Parachrom hairspring with high-performance Paraflex shock absorbers, approximately 70 hours of power reserve, Oystersteel Oyster bracelet with three-piece solid links, folding Oysterclasp with Easylink 5mm comfort extension link. Waterproof to 100 metres / 330 feet. Superlative Chronometer certified.