From when I was a kid, I have an Official Baseball (Spaulding) autographed by most of the 1956 New York Yankees. It's in very good condition. Signatures are:

Gil McDougald, Yogi Berra, Bill Hunter, Mickey Mantle, Don Larson, Sonny Dixon, Jerry Coleman, Joe Collins, Bob Grim, Robert Cerv, Tom Sturdivant, Norm Siebers, John Kucks, Bill Martin, Enos Slaughter, Tommy Byrne, George Wilson, Hank Bauer, Bill Skowron, Thomas Carroll, Bob Turley, Tom Morgan, Irv Norin, Jerry Lumpe, Charlie Silvera, Jim Coates & Ed Ford.

How can I determine the value of this?

Thanks all.