Up for sale is a SUPER tough single signed ball of the 4th commissioner of Major League Baseball, William (Bill) D. Eckert. Eckert served as Commissioner from 1965-1968, succeeding Ford Frick, and preceding Bowie Kuhn. Eckert was not a prolific signer, single signed balls are very hard to find. He died in 1971.
The ball is an Spalding Official Home Run King, with Eckert's signature on the sweet spot.