The 16660 was the first to feature a sapphire crystal glass, notably slimmer 1st series case, improved large helium release valve, matt charcoal dial with directly applied markers and was the first in the range to be supplied with the new Sea-Dweller tool kit.
The reference 16660 is the evolution of the ref. 1665 and has been produced from 1978 to 1988 circa.
It appears in the Rolex catalogues next to the ref. 1665, but only since 1981 it can be found on the price list.
Its nickname is triple six
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