1991 New York Yankees Team Autographed Ball including Don Mattingly, Graig Nettles, Buck Showalter, Steve Sax, and 25 other signatures JSA Full Letter Certified YY48537. In addition to those four names, the letter names the key autographs as Frank Howard, Torey Lovullo, Matt Nokes, Steve Howe, Stump Merrill, Jesse Barfield, Kevin Maas, and Pat Kelly. Additionally there are signatures of Alan Mills, Mike Witt, Greg Cadaret, Pascual Perez, Mike Ferraro, Steve Farr, Pat Sheridan, Jeff Johnson, Bob Geren, Scott Sanderson, and Mel Hall, plus a few others.