Why This Watch Matters The Sea-Dweller is, in many accounts, the ‘super’ Submariner, boasting a higher water resistance and a date window without a magnified crystal. The Full Story From its thicker case to the impressive depth rating on the dial, the Sea-Dweller makes no mystery of its raison d’etre: to go deeper than any Rolex Submariner. Since 1967, it has achieved this by integrating a gas escape valve that allows the helium to leave the case during a dive and prevents the plexi from popping up under the pressure. The first reference, the 1665, was already guaranteed to reach a depth of 2000 feet or 610 meters. But it also offered another advantage - a well-integrated date window without the magnified bubble found on the Submariner Date. Additionally, this dial deserves a long look, as it is the coveted Mark 2 “rail dial” with longer minute markers, similar to the version for Comex, the most famous customer for hardcore Rolex diving watches. The Fine Print Maker: Rolex Model: Sea-DwellerReference: 1665Year: 1978Case No: 57211XXXMaterial: Stainless steelDimensions: 40 mm diameter; 16 mm thicknessSapphire Crystal: No, domed plexiglassLume: Yes, tritium Caliber: 1570 automatic movementBracelet/Strap: HODINKEE Beige Leather NATO StrapLug Width: 20 mmBox/Papers: No What we Love and What You Should Know The rail dial of this 1665 is perfect, with the painted indexes exhibiting the same vanilla patina as the handset. It also comes with the original silvered date disc and a correct triple-lock crown and engraved case back. The case shows signs of a previous polishing but remains thick, as should be expected from any good Sea-Dweller. Note that this Sea-Dweller does not come on a bracelet, but with an Italian leather NATO.
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