The Gateway Stamp Company has been issuing cachets and other mail items meant for postal cancellation for several decades and they remain quite popular in several different collecting arenas. Mickey Mantle has signed this "40 Years Cooperstown" well-preserved silk cachet in brilliant black liquid roller ink. It's been cancelled/postmarked at Cooperstown on June 12, 1979 commemorating the 40th Anniversary of the dedication of the old Baseball Hall of Fame building. James Spence Authentication LOA included.