For such an amazing and timeless product, the Rolex site delivers and equally amazing Web site. My only complaint is the Sea-Dweller not being part of the Extraordinary Watches section. The Sea-Dweller includes all the technical marvels of the Oyster Perpetual movement with the additional ability to be submerged to 1,220 meters (4,000 feet). Also included are the Oyster fliplock bracelet (allowing the piece to be worn over a wet suit) and the helium gas escape valve (necessary for those spending time in a helium-enriched underwater habitat). These technial feats, which are unmatched by any other timepiece, should justify its placement in the Extraordinary Watches category.