Rolex Sea Dweller 1665 Double Red. The nickname refers to the two red lines on the dial which set it apart from the handful of prototypes read an in depth article here that feature just one line of red text. Those are as you d expect called single red sea dwellers.
Rolex sea dweller réf 1665 17 621. 1665 rolex double red sea dweller tropical mark ii patent pending ppdrsd sold 1665 double red sea dweller mark ii tropical dial thin case sold rolex submariner 1680 8 gold blue dial. Initial models were issued to deepsea explorers of the 1960s in various configurations but in the late 1960 and early 1970s the model made it to the rolex retail stores.
Those are as you d expect called single red sea dwellers.
For the first ten years of its production rolex manufactured the reference 1665 sea dweller with both the submariner and sea dweller names printed in red ink on its dial. Those are as you d expect called single red sea dwellers. Rolex sea dweller 1665 double red mark v unpolished 40 756. A double red sea dweller the same thin case as the rolex submariner.