Another legend from the deep from late 1967 / 1968.
A model that collaborated with Rolex on friendly terms.
300 meter 1000 feet T "Taucher"
A lot to be said about this one but you will have to do a little research until I have a chance to write a full exposé.
This falls someone under prototype as it was a transitional model.
Best
Bill
Ps sorry for the sunburn peeling. 