This is a Boxing Hall of Famers Autographed International Boxing Hall of Fame 10th Anniversary Envelope signed in black pen. The envelope includes signatures from Matthew Saad Muhammad, Emile Griffith, Leon Spinks, Carmen Basilio, Aaron Pryor, and Joe Miceli. The envelope is number 20. The International Boxing Hall of Fame was opened in Canastota, New York in the year 1989. The envelope is stamped on June, 13, 1999. Good Condition. Hollywood Collectibles COA