The product is a Mike Schmidt signed 400 home runs first day cover, encapsulated by Professional Sports Authenticator (PSA) and guaranteed by eBay's authentication service, making it a valuable and collectible item for fans of the Philadelphia Phillies and baseball enthusiasts. This original autographed memorabilia holds significance as it commemorates a milestone achievement by the Hall of Famer, making it a unique piece of sports history that can be cherished for years to come.