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davidcyclebackFor those unfamiliar with the issue, some vintage self developing photo baseball cards where sold as kits (I don't know how these particular cards were made). The kit consisted of a piece of photo paper, negative and a little stand, and the kid developed his own baseball cards. As someone in modern times with the original kit could make more cards using more photo paper, there is sometimes a concern if a card is the real vintage version. This is in part why the card with the original kit is most desirable, and why Leon was double checking to make sure his were old. There is particular concern about some 1930 Ray O Prints (includes Ruth, Gehrig). Luckily, it's not of great concern with other self developing issues because of their rarity (meaning, they obviously haven't been reprinted much if at all). Some non-Ray O Print kits are extremely rare, and it's probable that kits for certain cards no longer exist. If you find a rough grade and obscure (Have to use your Standard Catalog to identify it) self developing photo card in an old scrap book, it is more than likely the original.