I don't know if this will help and I may be operating with old information but I was very active in GU around that time (not since) and I believe each player got one box (6 or 12) of CS bats around that time. I have had in the past a few CS bats from the A's 1988-90 run so they were definitely around back then.
It was not uncommon for players to sometime use another player's bat, however I recall having 1 or 2 Mitchell bats and vaguely recall no writing on the knob like this one.
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