You should be able to tell by the placement of the '6'; if it follows EX-MT on the same line, it's pre-half grades. If it is on the line below EX-MT, it was graded (or reviewed) after half grades.
For example:

1934 Goudey Big League Chewing Gum - R320 #42 - Johnny Allen [PSA*6*EX‑MT]
Courtesy of COMC.com
__________________
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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.
Last edited by swarmee; 12-13-2020 at 02:17 PM.
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