Great White Sea-Dweller
As the company that invented the world's first waterproof watch, Rolex
has always been a leader in building watches that can survive in aquatic
conditions.
However, in the late 1960's, deep-sea experiments called for a
different kind of watch – one that could withstand the extreme pressures
of saturation diving. From this initial need, Rolex reinvented the dive watch, and created the first Sea-Dweller . 
Crown Vintge SeaDweller 1665

Sea-Dweller 1665 “Great White” Caliber 1575

Experimentation with these modified Submariners led Rolex to create the Sea-Dweller, tripling their previous depth rating. The first ever Rolex Sea-Dwellers were modified Submariners, and they did not feature helium gas escape valves. It is believed that 30 such watches were created, although few remain as most failed during saturation dive testing.

Stainless Steel SeaDweller 1665

Sea-Dweller

1665 double-red sea dweller

The reference 1665 Sea-Dweller is significant to Rolex's history because it represents their ongoing pledge to produce high-quality timepieces that excel in extreme conditions. As soon as advances in diving technology created the need for a new kind of dive watch, Rolex was there to fill that need with a watch that surpassed every necessary specification. vedere di piu rolex imitazione e Rolex Submariner