This Yaz professional bat is totally MINT and has never hit a ball. It appears to date to the late 1980's, prior to team names being branded on the barrel in 1991 or 1992. It is an M110 model with his full name in block letters and the model number on the barrel. The knob has no markings of any kind.  All markings are deeply burned-in and is in the natural finish which he often used. The bat is 34 inches in length and weighs 31 to 32  ounces. Yaz's Louisville Slugger ordering records indicate that he did us this weight and length of bat from time to time during his long Hall of Fame career with Boston. Additionally, it is marked POWERIZED which all H&B pro models of this time period had to be marked. Rather than "Flame Tempered" which was only branded on store model bats.  Clearly from the mint condition of this one, he did not use it for game use or even batting practice. Still however, it is a pro model bat in a size he used when active as a player and a great piece to have Mr. Yastrzemski sign! All inquiries are very welcome.