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davidcyclebackThe album pages are card stock like the regular cards, while a poster would presumably be paper.
There are Allen & Ginter baseball card ad posters and you'll see Buchner Gold Coin handcut/blank back cards that were cut from posters.
I've never heard of a faked or forged Allen & Ginter album or poster cut out card. If someone's going to forge an Allen & Ginter it's going to be the regular card as they're worth multiples more.