Posted By:
MarkValue depends largely upon the quality of the autographs. If there are 2 Gehrigs, and the key signatures are all in nice shape (with no visual distractions), I am guessing it's worth $10,000 - $12,000.
I don't think this piece would fetch anywhere near the $50,000 your friend is looking for. In addition, he would likely have to pay the auction house a consignment fee. It will be lots easier to assess the value, after you've posted the pictures....