Description:Heinie Zimmerman professional model baseball bat c.1912-1919. Spalding "Autograph" model bat with Zimmerman facsimile signature burned in measures 35.5" long and weighs 39.9oz. Strong usage wear is evident throughout including grain swelling and a handle crack (visible below period tape applied to aid in grip). Graded by PSA "GU 8" (letter not included) and includes LOA from Hunt Auctions: EX