I have three air mail postage stamp booklets and I am not able to identify and differentiate them. (BK C14, 15, 18, and BK19) All three have BC 13B and slogan 3. I realize that to properly ID them, I would need a UV light which I don't have. I am hoping that somebody will be able to help me by looking at my pictures. In advance, thank you very much.
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Posted 12/15/2020 4:56 pm
