Rolex's first Submariner with date, the reference 1680 was introduced in 1968 with much success. Collectors will make a distinction between a reference 1680 with red writing on the dial and a reference 1680 with all-white writing as the present watch. Rolex changed to the all-white print dial in 1976/77, marking the end of red writing on the Submariner.
For a detailed description and further illustrations of reference 1680 with all-white dial see Rolex Submariner Story by Franca and Guido Mondani, pp. 100-103.