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The fiercest competition was among the Swiss
making it one of the first Mark XIs to enter service
when the Rolex Day-Date debuted in 1955
With its flared lugs
the first wristwatch with rotating outer bezel
Rolex Sea-Dweller Accessory The fiercest competition was amongWhy We Love It In 1978, the original Sea Dweller (Reference 1665) was replaced by the Reference 16600. This new model boasted an even greater depth rating: an impressive 4000 feet (or 1220 meters). This was possible, in part, due to a larger Helium Escape Valve. Visually, the 16600 stands apart from its predecessor with a glossy dial featuring applied luminous markers. The internals were also upgraded with the Calibre 3035 movement. Rugged,
