Autograph of Heavyweight Champion Michael Spinks on the Sept. 30, 1985 SI. Lot 329. Autograph of Heavyweight Champion Michael Spinks on the Sept. 30, 1985 SI. Ex+ issue shows Spinks defeating Larry Holmes. Sharpie 10 signature. Authenticated by Kevin Keating. Winning Bid $25. Back to List Winning Bid $25 Back to List