The present Sea-Dweller reference 1665 features both a purple bezel and case edges with original beveling, as well as it's Double Red writing. Rolex aficionados divide the classic Sea-Dweller reference 1665 into four distinct series, each one with subtle differences in dial design. The four series are also called "Mark" and are sometimes abbreviated to MK. The present watch has the much sought-after Mark II dial. One of the special features of a Mark II dial is that the word "Submariner 2000" is written smaller than the word "Sea-Dweller" above it. The oval at the base of the manufacturer's crown symbol is also much smaller than on the other three series. Moreover, the letters "D" and "W" of the word Sea-Dweller are very close to each other, almost appearing to touch, which is not the case with MKI, III or IV.
The bezel of the watch has changed from black to a warm purple color, and the case edges have clear, crisp beveled edges, making the overall ensemble very appealing. The crystal for this watch without Cyclops lense above the date and with its typical dome-shape is known as "superdome". Italian collectors refer to it as "cupolone".
For a description and detailed illustration of other Double Red Sea-Dweller reference 1665 watches see Rolex Submariner Story by Franca & Guido Mondani and Lele Ravagnani, pp. 160-171.