.....this dial confuses me a bit.
From 1963, that is a pre-tritium period, yet it has the tritium print on the dial. I would have expected just a single Swiss on that dial. The typical double swiss, as you know, doesn't have that tritium. So, since I have never seen one of these before and am also not sure how a tritium marker can appear on a 1963 GMT, then i will leave it to anyone else who has an insight. With Rolex, especially in this era, one cannot rule out anything. I, too, am curious to hear what others think.
Best
Joe