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The Rolex Sea-Dweller 16600 was presented in 1988 to replace the preceding Ref. 16660 "Triple Six" (666) Sea-Dweller. The Ref. 16600 had a long production run, from 1988 until 2008, and during that time , the luminescence material on the dial changed. Up until about 1998, the Sea-Dweller dials included tritium lume, which was eventually replaced by SuperLuminova. The presence of tritium is signified by the "SWISS-T<25" label below the 6 o’clock marker. Naturally, when Rolex used SuperLuminiva instead, the label changed to just say "SWISS" and then a while later "SWISS MADE" like on this specifically watch.
The Ref. 16600 ran on calibre 3135. The Rolex calibre 3135 automatic mechanical chronometer movement has 31 jewels, a frequency of 28.000 BPH (beats per hour), and a power reserve of 48 hours. The ultimate Rolex workhorse, the calibre 3135 is still used in today’s Rolex watches - more than 30 years after its 1988 debut.