This extraordinary First Day Cover (FDC) is from the release of the Bobby Jones and Babe Zaharias U.S. postage stamps in 1981. It is postmarked at the release location of Pinehurst, NC. Quite amazingly, this FDC is autographed by the first four golfers to complete the career Grand Slam - Jack Nicklaus, Ben Hogan, Gene Sarazen, and Gary Player.
Letter of Authenticity from James Spence Authentication (JSA)