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 has a ‘Tiffany & Co’ signature above ‘Sea-Dweller’.
