I do not own one, but I’ll say something. First, since they are not printed they are not like any other ad back. Second, you really have no way of knowing if they are real or not since anyone can make up a stamp. Finally, if a merchant was making a hand stamp to stamp the cards he gave away (it was cheaper to buy blank back cards than buy cards with ads printed on the back, I assume), why wouldn’t he stamp the card so the hand stamp with the ad could be seen rather than leaving so much of the ad off the card? I’m generally skeptical and I would stay away.
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