Beautiful single signed baseball from the mid 1960s. Almost all the ones you find have faded badly over time, this one has not. The ball is a leather Harmon Killebrew Wilson souvenir ball. It is genuine leather, same as a ROMLB, so the signature has not faded/bled over time like synthetic would. The signature is big and strong, taking up an entire panel. He also inscribed “Best Wishes” without a personalization, which is uncommon as he almost always would make the ball out to someone when adding that inscription. This is a rare more desirable to many vintage collectors “playing days” signature of one of the all-time greats. His signature has changed over the years, as his earlier examples show more letter detail and present nicer IMO. Not many nicer early signatures of Koufax out there. Full PSA letter included.