I might be wrong, but it seems like that wavy plastic sheet is found more on non-standard size cards like strip cards and a lot of the E cards from the 20's. For T206's, the older slabs for American Beauties have it too as they are narrower than the other backs. BTW...I think they look terrible.
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- Jason C.
***I've had 50+ successful BST transactions as both a buyer and a seller. Please feel free to PM me for references***
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