As a kid, I remember this guy who used to write his name on the backs of all his comic books. Kind of irked me when trading, as his signature was like a 5-year old's. On the other hand, 'Paul's Magazine Stand' did the same, and as long as it was a neat, straight stamp, it didn't bother me at all.
No one did that to cards when I was a kid, but I think it would bother me. Cards are too small, and a stamp too conspicuous. A vintage stamp on a vintage card is okay, but if I were a kid back in 1910, it might have bothered me. A modern stamp on a vintage card would be (IMO) ridiculous.
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