The Mick's 132nd HR came during his 1956 Triple Crown season. It was from the left side of the plate at Yankee Stadium off fellow Hall of Famer Bob Lemon. Why is that one round-tripper so relevant? It's the limited-edition number on this creamy OAL (Brown) ball with a blue-ink "8-9" sweet-spot signature. There's an isolated, small purple spot on the north panel (not visible when viewing the signature head on). Auction LOA from JSA.