Grading companies didn't exists in the 70s. Therefore high grade meant "in uncirculated condition." So they're either waiting to be found again or they're in private collections that don't care as much about grading.
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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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