Parallels are usually reserved for an intentional variation on all cards in a complete set. Gray backs are only on certain series, right? And would paper stock be considered intentional back then.
I would not consider these to be a parallel, myself.
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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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