Your unlikely to ever find one of these again. Charm is marked Sterling and attached to Napkin ring that though it does not have an additional mark we believe it, too, to be made of Sterling as the piece was manufactured as a single unit.
This was the Napkin Ring used at the 1982 World Mercy Fund Gala held after the Concert at Carnegie Hall and hosted by Frank Sinatra and his Wife Barbara. Star studded list of Entertainers and each ticket/plate cost $1,000.
See pictures for condition details which include some normal small marks from storage.