I can't answer the bat model number question, but the idea of Frank Thomas equipment oddities is more than just talk.

I don't know about bats, but in 1993-94, when the White Sox were among the elite teams in MLB, the team issued numerous jerseys and 1B gloves for fundraisers and charity auctions that were never issued to Thomas, often autographed, however. The jerseys were discernible based on tagging, and the mitts were among items the Operation Bullpen forgers doctored to make them look game used, as one of the crooks worked in security for the Sox at the time.

While I can't unequivocally say either way about this specific bat, it's not something to be readily dismissed, either.

Dave Miedema