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JimBI used to own the PSA "Authentic" Cobb/Cobb back (until a couple of weeks ago) and it did not have the gloss on the front. It was just like every other T206 Cobb red on the front. Contra Brian Wentz' claim, it did NOT have gloss on the back either. Unless Brian is referring to a different "Authentic" example, the one PSA "Authentic" example that I am aware of does not have any gloss on either side.
JimB