劳力士，不锈钢自动上弦链带腕表，配中心秒针，日历显示及热带棕色表盘，SEA-DWELLER，型号1665，约1967年制

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.