There is pretty steep competition between Rolex models when referring to the historical significance of each one, however, the Sea-Dweller is undoubtedly one of the most important watches ever created. First introduced in 1967 with the reference 1665, the Sea-Dweller featured innovative patented technology that helped further human exploration to parts otherwise considered impossible to reach. In collaboration with Comex and utilized in the famed SeaLab missions, the Sea-Dweller built upon the existing Rolex Submariner platform to increase the depth rating of the watch to an impressive 2000ft. This impressive increase in possible depth was the result in bulking up of the case, but more importantly, the invention and development of the Helium Escape Valve or HEV which allowed for helium molecules to transfer in and out of the watch case without damaging the watch.

Helium gas was essential in the breathing gas mixture used during the experimental saturation diving missions at the time, however, due to helium being such a small gas particle it was able to enter watches during the missions but without a method of the gas, to escape would cause the watches catastrophically fail upon decompression. The invention of the HEV was revolutionary as it allowed the helium gas watches to "escape" during decompression, thus making the watch able to reach unheard-of depths at the time.

"Modern classic" is a phrase we seldom say here at Craft Tailored, being true vintage enthusiasts at heart, however, the Sea-Dweller ref. 116600, commonly referred to as the 'SD4K', is one such watch. Only in production for a short run, from 2014-2017, the SD4K was the first ceramic bezel Sea-Dweller, the last 40mm Sea-Dweller, the last Sea-Dweller to lack a cyclops over the date, and also incorporated a matte black dial back into the design. So in our eyes, it's the most modern, yet classic interpretation of the original Sea-Dweller design.

SPECS

CASE & BRACELET

The thick and robust case, designed to withstand depths of 4000ft below the surface, is in excellent condition overall, exhibiting minimal signs of previous use and appearing to have been polished possibly only once in its past as the factory shape and dimensions remain fully intact. The ceramic bezel is in flawless condition. The case back is also exceptional with the factory black enamel within the engraved text all remaining fully intact. The original Rolex 97400 Oyster bracelet features some light scuffs on the clasp, which is to be expected, and retains 8 links along with the diver's extension that show no stretch. The watch comes with 3 additional, making for a fully linked bracelet when installed.

DIAL & HANDS

The original matte black dial with white gold surround markers is flawless. The original hands are flawless.

ACCESSORIES 

The watch comes complete with its original inner and outer boxes, serialized hang tag, Rolex guarantee card, booklets, and 3 additional bracelet links. The watch is keeping time perfectly, previous service history is unknown.