1989 World Series 5 x 6 1/2 inch commemorative postcard produced by USPS, postmarked Oct. 17 in San Francisco the day Game 3 (postponed until Oct. 27 by the earthquake), autographed in blue Sharpie by Oakland a’s ace pitcher Dave Stewart, who was named World Series MVP. Obtained in person at celebrity golf tournament several years ago. With certificate of authenticity from AutographsForSale.com. ONLY 2 AVAILABLE FOR SALE.