2017 Rolex Sea-Dweller 4000 'SD4K' (Ref. 116600) W/ Full Set

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.