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There are so many cards. Could you please forward some photos. The black and white photographic ones are popular . Is that what you have? Greg
Well as it seems you are aware, even photos will not easily differentiate between originals and copies. I do not collect these things but do have two customers with internationally known collections. One has written books on the subject. Here's their advice (which you may know of) :-
Lockdales Suffolk Ipswich
Warwick and Warwick
It is a specialist field and their opinion will stand up to any questioning. I have consigned items to both i the past. Greg