Only because we have first hand knowledge, people who collected these cards in 1947-49. Therefore we know what to look for. To print them in any other years, they would have to have copied them from the original cards, when this is done we can tell. As I have said, you would need the original photos or negatives to print from. There is 99% chance the people who would have printed the exact cards would have the originals, therefore, you would have a copy of a copy, which will leave a patter in the printed card.
I was in printing for 40 years, I can tell when it is a copy from something that has already been printed. Look at the examples, you can tell the one that was copied from one that was printed before, and the one that was printed right from the original photo. The top card is the fake.
As for the card stock it would not match any of the samples we have from 1947-49 paper stock. You can use a black light to tell new paper stock from paper stock that was made in 1947-49. John
Last edited by Johnphotoman; 12-07-2024 at 07:17 AM.
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