Many other questions need to be answered before a value is assigned. One factor is how legible and clean the autograph is. Another factor for baseballs is what kind of Baseball did he sign? If it is a MLB issued National League baseball from the time he played, it will be worth more than any other baseball, including a recent MLB issued ball. You can gain a good estimate of how old a MLB issued baseball is by looking at the name of the Commissioner on the printed part of the baseball. The final and perhaps most important factor is whether or not the autograph on the ball is authentic. If a reputable authenticator has authenticated the signature, the baseball is more valuable to a collector/buyer. Some of the more reputable companies authenticating autographed memorabilia are: PSA, AAU, Steiner, JSA, and Tri-Star. A final factor determining value is how many are out there. One must consider how many items the player signed. If a player rarely signed items, that will drive the price up. Autographs of players who signed a lot tend to be lower priced. Bob Feller signed a lot. George Brett has not. I am guessing that a Carl Furillo signed baseball should be worth somewhere in the neighborhood of $25-$80. I paid $85 recently for a Willie Mays signed ball.
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