Have you thought about asking over on the Vintage Rolex Forum? You might find the right calibre or expert over there.
FWIW (and it's not a lot because I am definitely not an expert), but every kosher Rolex dial that I have seen has always had the 'L' of Rolex centred under the crown. This dial doesn't have that. So it might not be all as it first appears, I'm afraid.
Good luck with your research.