There is a Franklin Mint web site, but it is concerned only with contemporary FM products. There doesn't seem to be any history of earlier items. A scan of the FM site for "casino" returns nothing.

There are printed FM catalogs and guidebooks, though. In the sixties and seventies, there was one issued each year. I have 5 or 6 of them. There are also catalogs done by an independent publisher. I don't believe any of these contains lists of all the sterling foreign tokens, though.