As you are looking for a quick informal estimate, if the ball is a team ball (say, 25+ signers), the ball is nice and the signatures are in great condition, as you say, I would say $200 plus or minus. Good strong signatures are always in demand, as a lot of vintage team balls, even from the 1970s and 80s, have light signatures.
There are others on this board who know more than I about autographs, but this is 2 cents from someone who has bought and sold team baseballs.
Last edited by drc; 06-09-2009 at 03:25 AM.
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