Vintage Rolex Submariner reference 5512 with silver only writing from 1960s

This Rolex Submariner 5512 was delivered in the early 1960s, possibly 1961. It has a unique dial which is very rare and was only made for the US market.

All writing on this dial is in silver.  While it carries a tritium marking at 6 o’clock, it is still a radium dial.  These are very rare and I have seen it for the first time.

The dial is in excellent condition,  and the watch is quite a stunner!  And the hands and indices match in terms of patina.