Replica IWCThe dive extension on the Sea-Dweller is actually nothing to write home about, but it's sufficient. This is one of the biggest improvements of the new Sea-Dweller DEEPSEA. Triplock screwdown crown. The Triplock system uses an additional rubber gasket (clearly visible when the crown is unscrewed) beyond the Twinlock system used on many other Rolex sport models like the old GMT Master II and the Explorer II. Replica IWC
Ultra-thick synthetic sapphire crystal. Unidirectional rotating bezel with a corrosion resistant anodized aluminum insert. No date magnifier. I don't mind the "cyclops" on my Explorer II, but I prefer the cleaner look of the Sea-Dweller. Helium escape valve. Developed in cooperation with the French industrial diving company, Comex, the helium escape valve allows helium molecules to safely escape without popping the crystal off the watch during decompression (I told you this is a hardcore dive tool). Dive extension. Replica IWC
