The value of a multi signed Baseball cannot be priced by the value of each signature added up. Multi signed baseballs are valued as a group of signatures, and how desired that group is as a whole. This does not necessarily mean that two signatures will sell for less than one, but in most cases it does, or at least not the full value of the two signatures added up.
A Babe Ruth signature is 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 may vary based on condition, and the type of authenticity that accompanies the signature. If the signature is not properly authenticated the signed baseball could sell at half the market value or less. I could not find any auctions featuring a Babe Ruth Bob O'Farrell Dual signed baseball. It would most likely sell for less than a Babe Ruth single signed baseball at about $4,000.-$6,000.
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