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I have some postcards from the 1950's and 1960's that are printed on an interesting material, and I'm trying to figure out what it is. Maybe it's just paper, but I'm not sure about that. The cards have a grid-like texture, like a nylon jacket with ri...

Is anyone in here into QSL postcards? They are the cards that amateur radio operators send to one another as confirmation of receiving each others signals. Some of them have really cool artwork or photos. Sometimes they used regular postcards and wro...