Once the program is signed it would be considered a flaw in the condition of the program and cannot be given a high grade. The bulk of the value will rely on the value of the signatures but you did not state who signed it. If the signatures appear on the cover they could be valued as a single item compatible to a signed 8 x 10 photo or lower.
If the signatures are signed on the inside they would be valued as "Cut Signatures" and each signature would be valued on it's own merit and the value of the program can be restored based on the condition of the cover. If the signatures are not properly authenticated they could sell at half the market value or less.
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