With all due respect, I would ask what year are the watches, what market were they sold in and how are we certain its not radium and what is it then if it isn't.
I'm not suggesting these watches are from 1965 but by way of example just to illustrate the size of the US market in 1965 compared with the rest of the world combined markets, as this is from an unimpeachable source as per Mr Myers only 100 to 300 watches a week were being imported by Rolex into the USA say maximum of 15000 watches a year. So for 1965 as an example the other approximately 120,000 watches were going to other markets which until the 1963 Rome convention came into force (some time later) generally had absolutely no restrictions on the type of luminous material that could be used. The 1965 example may hold true for earlier years as to split of the USA:rest of world market shares.
So if in general for most of the world there are no restrictions on your lumi material until after 1963 Rome treaty implementation deadline, which represents the major part of your sales why mark your some or all of the rest of world dials..
You might want to mark the USA dials, one to show conformance to the standard if the material is tritium and secondly especially bearing in mind that the USA suffered from duty free sales thru the backdoor from the 60's onwards i.e. non Rolex USA imported watches. If I was Rolex USA I'd be pissed off by that loss of profits and just by way of interest from when did they start to restrict importation with copyright infringement of Rolex watches into the USA. it would make it terribly visible if eg only the USA dials were marked at this time
Just a passing thought
All the best
Apologies for the amendments, spelling and presentation errors.