Original paperwork from previous sale of guitar notates that the signatures were obtained on July 28, 1989 in St. Paul, Minnesota. Vaughan had played Riverfest that day during his In Step tour. Single-signed guitars on this six-string legend are scarce, and double signed examples are essentially nonexistent. Accompanied by a full Letter of Authenticity from music autograph authority Roger Epperson/REAL Authentication as well as a Letter of Authentication from Beckett/BAS.