Rocky Marciano Hand-Signed Autographed Envelope Cut Signature JSA LOA *BOXING*. Rocky Marciano is widely considered one of the greatest boxers of all time, and is a quite rare autograph. This envelope measures 2.5”x4”, and the autograph is perfect for a custom trading card or simply as a historical signature piece. The signed envelope is from the Imperial Theatre in Montreal and was signed in 1956.