Looking for a silver consultant....

Hello,
I am searching for a consultant that knows how to research silver marks and not just American but British, German, Danish, Russian, Latin American. Any ideas? We are an art research type firm looking to branch out into other areas and thus we are looking for a consultant to tend to our client inquires. Thanks everyone…appreciate the advice.
Stacy

not easy to find all in one - European thats me :smiley: