It is difficult to put a value on a dual signed or multi signed Baseball. The value of the signatures cannot be added up to come up with a total. Multi-signed baseballs are valued as a whole, and how desired the signatures are as a group. You did not mention which baseball commissioner signed the baseball. Two commissioners were in office during Sandy Koufax's playing days Ford Frick (1951-1965) and William Eckert 1965-1968. Either way which ever commissioner signed the baseball it will only add value if the signature is desired by a collector buying a Sandy Koufax autograph. It also works the other way. A collector looking to buy the commissioner's signature, might not desire the Sandy Koufax signature and the value will be higher or lower accordingly. A Sandy Koufax single signed baseball is worth between $250.-$400. And with the added baseball commissioner's signature the value should be more or less depending on the factors mentioned above, and which commissioner signed the baseball. A Ford Frick Signed baseball might be worth somewhere between $750.-$1,000. and the value of the Dual signed baseball could be between $400. -$750. Again, If the two signatures are desired together. The Ford Frick signed baseball by Itself might be worth more.
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. In a recent auction a Sandy Koufax single signed baseball sold for $310
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