Rolex Submariner 1680 Single Red Writing MK IV – vintage 1972. This very rare special MK IV Single red writing submariner has got to be one of the collectors favourites due to its distinctive red font “submariner”. Our example with the MK IV dial is the very first of the feet first Reds with the distinctive open sixes and the = sign slightly to the right of the “A” in SubmAriner, also the F on the Ft marker is much more squared off which are not featured in any of the other single red dials. After 45 years our all original sharp example still with matching dial and hands and still Fitted with the original flat link 9315 Oyster bracelet with 380 end pieces. This particular Single Red Mk IV dial certainly holds a significant place in the history of the Vintage Submariners.