The 1680 Submariner was introduced in 1967 and up to ‘76-’77, it came in a famous variant known as “RED SUB”.
In this configuration, we can find 6 different “Marks”: three “METER FIRST” (depth in meters and in feet) and three “FEET FIRST” (depth in feet and meter).
By the way, we’ll now focus on the three “Marks” that the 1680 “WHITE” came with. This is the model that Rolex sold between 1977 and 1979, with all white graphics.
All dials are “FEET FIRST” and we want to specify that there is no chronological order in the different marks release. We can find MK1 with high serials and MK3 with low serials.