Hey guys,
I was digging through some German postcards I bought at an estate and found these. Does anyone know if these are authentic and what were they used for? I tested them with a blacklight and they didn't glow.
Thanks in advance!
I was digging through some German postcards I bought at an estate and found these. Does anyone know if these are authentic and what were they used for? I tested them with a blacklight and they didn't glow.
Thanks in advance!
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