The COMEX Sea-Dweller Ref. 1665

The first COMEX labeled Sea-Dweller is the ref. 1665.
Note the lack of the word “DATE” after ‘OYSTER PERPETUAL” despite the fact that the Sea-Dweller is indeed a date model. Only 300 ref. 1665 COMEX were produced from the late 1970s to the early 1980s carrying the COMEX issues numbers 2000-2300.

Like Sea-Dweller watches that were sold to the public, there are different dial variations found on the COMEX ref. 1665. The first dial variation is a “Rail” dial, where the “C” in “CHRONOMETER” lines up with the “C” in “CERTIFIED.” Even more interesting, however, is the depth rating on the original dials of the COMEX Sea-Dweller ref. 1665, which say 2000ft = 600m.
The other dial variation of the COMEX Sea-Dweller ref. 1665 were actually service dials and they did not have the “Rail” alignment of the letter “Cs” and the 600m was replaced by 610m.