The Sea-Dweller 16660 ‘Triple Six’ was the first Sea-Dweller to be fitted with a sapphire glass. The first series used matte dials (divided in Mark 1 and Mark 2 variants) while the second series used the newer gloss dials. It was replaced by the 16600 in 1988.The present watch was made for the Comex diving corp – it is part of the first series of watches delivered between 1980 and 1984. It is estimated that only some 50 had the matte dial as seen here.
