THE ACTUAL SEAT BACK HAS BEEN AUTHENTICATED BY MLB - CERT# LH461084. Yankee Stadium Seats- Tier Reserves. The item "DON MATTINGLY NEW YORK YANKEES SIGNED ORIGINAL YANKEES STADIUM SEAT BACK WithJSA" is in sale since Saturday, October 12, 2019. This item is in the category "Sports Mem, Cards & Fan Shop\Game Used Memorabilia\Baseball-MLB\Other MLB Game Used Mem".The seller is "majorleagueautographs" and is located in Hialeah, Florida. This item can be shipped to United States, Canada.