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Rolex Sea-Dweller 1665

Description

Ref 1665-1-2 ROLEX Sea-Dweller "Great White" MK IV

During decompression, helium must be expelled from the watch case, and on the early Submariners, when decompression was too rapid, it would escape by popping the crystal. … This is how the story of the Rolex Sea-Dweller began. MK IV Dial: On this version, the 'R' under the '2' is not aligned in the same way. Additionally, the '6' in '610' is rounder than on the MK3 version. Production observed between 1981 and the end of 1983.

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