100% authentic from an old sports collection I purchased last summer amassed in the 1970s and 80s. NO COA. This one is circa 1970s. You can get it authenticated yourself if so desired and it'll pass with flying colors. 100% authentic from a known signing. The two brothers that collected the collection I purchased both attended signings so I had two of these. Much like the Mickey Mantle I'm about to list. I sold the lesser of the two Mays last year. This one is in excellent condition with an excellent clean, nicer signature.