I know that many autograph collectors collect vintage photos, but how to find out what photos are really old and original and what are just good modern prints? I know about "Clarence Sinclair Bull", MGM and so on...but all this photos have at least some inscriptions. I have recently purchased a collection of autographs and photos- and I want to sell part of the photos on Ebay. The photos are 8 x 10 and I think they are pretty old. There are no inscriptions on the photos (only some numbers on one of them). What do you think of them?