These index bats were supplied by a given team for general use, rather than being ordered for use by the player whose signature is stamped on the barrel. They were often used in Spring Training so players could try out different models so they could order bats before the season started. Even though the bat does show heavy use with deeply embedded stitch marks and cleat marks, the use cannot be attributed to The Mick. The model number K55 appears on the knob. Louisville Slugger factory records from July 18, 1968 show that Hall of Famer Mickey Mantle ordered three 34", 30-ounce K55 bats. This bat is too heavy at 34.5 oz, though he did order this particular weight in another length and era. MEARS A8 LOA.