Willie Mays 660 #24 Signed Official Major League Baseball Mint Condition! Includes JSA LOA.  This is one of very few Willie Mays signed baseballs on a Official Major League Manfred baseball.  The condition could not be any nicer!  The 660 inscription is perfectly centered (rather than off to the side) and the #24 inscription is huge!  It would be tough to find a Mays ball of any type that would display better than this ball.