勞力士，不鏽鋼自動上弦鏈帶腕錶，配中心秒針，日曆顯示及熱帶棕色錶盤，SEA-DWELLER，型號1665，約1967年製

Launched in 1967, the Sea-Dweller reference 1665 was the first Rolex wristwatch designed for use in saturation diving. It featured a Rolex patent valve in the band, first developed on the Submariner model, to allow helium and other gases to escape, which would enable the watch to stand compression at deep depths.
Enhancing its overall appeal, the watch stands out through its very warm and appealing tropical dial. Gradually changing from black to a dark brown colour.