Ok vielleicht hilft das ja......

Quelle: tomvox1/VRF

...albeit a while ago. And while I have all the respect in the world for Mr. Dowling, I have never seen a Rolesor sports model, either in the flesh, in a catalog or on the internet from before 1969. The excellent database here at VRF lists the earliest 1675/3 as 2.7mil/1970 model. And Antiquorum says a few of their TT 1675's are from "the 1960's" but until recently, their dating system was about as reliable as Catherine Deneuve if you asked her age. I guess I'm living up the "doubting" part of my namesake but I sure would like to see a two-tone GMT from before 1969 to be convinced that one actually existed. I'll try to get to the bottom of it, though, promise you that! All the best, Tom
Quelle: Richard Craver/VRF

...and does not mention the TT in the blurb at the bottom, just 18K and SS. To my memory, maybe a '69 is the oldest I've seen, mine is a '72, obviously, the subject needs revisiting!