...but usually one finds this particular dial later in production, circa 1964-67. What does the caseback date stamp say?
This is a real crossover period for GMTs with a lot of different dials popping up within a 2-3 year serial # range.
Could be that some 1675s were assembled out of sequence, perhaps due to Rolex trying to get their ducks in a row for the new Tritium regulations (T-25). This may have required a swap to the SWISS T-25 dials and delayed the release some watches for as much as a year or two.
So one sees chapter ring, non chapter ring, double SWISS, Underline, etc, all in a relatively short span of 62-64.
BTW, on these, glowing original lume is quite normal and that lume is definitely not Radium.
I would think the original dial for this watch could be either a chapter ring "Tulip" coronet dial or a "serrated" coronet dial w/o ring still probably SWISS-only.
But it's very hard to say with 100% certainty because it may have been Rolex themselves who changed this dial or sold it as "new" some time after the serial number suggests.