Placing a value on an autograph is subject to trusting the autograph's authenticity. You can have the piece authenticated by going to Google, and typing in "Sports Memorabilia authenticating services" and contacting one of the websites listed. After the piece is authenticated, you can go to eBay and see what authenticated Ralph Kiner Autographs are selling for. If you don't want to go through the authentication process, you can, again, go to eBay and see what the autographs are selling for. it will sell for a higher $$ amount if it is authenticated, but it is a process to go that route. It is up to you to determine how much time/effort you want to put in to the sale of your item. Good luck!
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A Ralph Kiner single signed Baseball is worth between $40.-$60.
Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the baseball. Signatures that have not been properly authenticated could sell at half the market value or less. Add for inscriptions. In a recent auction a Ralph Kiner single signed baseball sold for $57.36