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RhysAny person off the street could pay a little more and have his/her photos developed into real photo postcards from the negative so there are thousands of Real Photo Postcards of Athletes out there that were unique when they were made in the 1900's and are unique today. Just because an item has a postcard back does not mean more than 1 copy ever existed or that it was produced for resale by a photographer (although many were).
Rhys