You may have to go higher up the chain. Is the front/back combination a recognized combination? Or is it one that could only be a printer's scrap because it was unreleased?
Now that they break out all the different backs/factory numbers, it may not "exist" in the official "set" of pack-released T206 cards.
When you submitted, did you comment "SLAB AS AUTHENTIC IF IT DOES NOT GET NUMBER GRADE"?
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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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