I know that on cards that were produced with factory packer back stamps (like the T51 set), PSA no longer gives those cards MK designations. I had a lot of 8 old flip cards with MKs sent back and "reholdered" with them no longer having the MK qualifier.
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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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