One of the most prized signatures in the hobby a Babe Ruth single signed Baseball in general is worth about $6,000.-$10,000. 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.
Muti-signed baseballs that were passed around during the signing will sometimes have two signatures of the same player. I have never seen a baseball selling at a higher value because of this but then again I have never come across a baseball with two signatures of a player of Babe Ruth's stature.
A team signed or multi signed baseball with two Babe Ruth signatures might sell at a higher price as a novelty. A baseball with two Babe Ruth signatures on the same baseball with no other signatures will sell at a significant higher price if both signatures could be viewed together when displayed. Otherwise the baseball will sell for more, but not twice the value.
The baseball would have to be of the attention of collectors that find the duel signed Babe Ruth baseball intriguing, and have the money to spend on the novelty. The baseball might also be valued or compatible in price as a Babe Ruth signed, and inscribed baseball. Condition of the signatures will still be a factor, with each signature being graded on it's own merrit.
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