This is an authentic signature, on an official postcard of the Induction plaque of Enos Slaughter, showing the actual plaque that hangs in the National Baseball Hall of Fame and Museum in Cooperstown, New York. The autograph includes lifetime Certificate of Authenticity, The Postcard measures 3-1/2" x 5-1/2". Pioneer Sports Cards has been in business, in Cooperstown, since 1989. Shipping is $3.50. Thank you.