Jose Canseco autographed Oakland Athletics first 40/40 player 1988 Gateway cachet

Gateway Cachet envelope issued to commemorate Jose Canseco becoming the first MLB player to reach 40 home runs and 40 stolen bases in a single season, postmarked in Milwaukee the day of the historic 1988 game and autographed by Canseco in blue ballpoint pen. From a paid signing with Gateway, with certificate of authenticity from AutographsForSale.com. ONLY ONE AVAILABLE FOR SALE.