It really makes sense. Think of a button base with a slit to stick the "card" in with a little glue and move around a board. The fact that they're so narrow also is a point in their favor.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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