never seen those
I don't think I have seen those before. What size are they? I know they aren't stamps but have some characteristics (black and white with rudimentary info and blank backs etc... ) of a few circa 1940 stamps, Associated Station and Signal Oil ....though they aren't identical by any means...Interesting cards. My initial thoughts, if I don't know or have ever seen something is to lean towards an ad cut however, I think there are still new sets to be discovered too.
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Leon Luckey
www.luckeycards.com
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