In the late 1960s Rolex added a date display to the steel Submariner, with the new model 1680/0. For the first few years the word SUBMARINER was written in red and these models are especially sought after now. Do be careful, as the difference in value has tempted many to try to turn a genuine watch with an all-white text dial into one with the precious red text. Note that this genuine example ( which is in need of a new acrylic glass ) has the 660ft = 200m format of depth rating. An even earlier version with red text and the reverse 200m=660ft depth rating is worth more again.