does anyone know what an old autographed baseball is worth?

[G.R.H.]

guys, i found a baseball that appears to be beat up and smeared, but it has the names of what i guess was either the yankees or the mets team back then. (lou pinella, reggie jackson, craig nettles, rick cerone, etc). sorry i can't remember if they were yankees or mets. anyway, does anyone know what this baseball is worth, or how do i find out? it's gotta be at least 30 years old or more. thanks! 

[danielson]

Look around here

http://www.google.com/products?hl=en&client=firefox-a&rls=org.mozilla:en-US:official&hs=m8&resnum=0&q=ebay+baseball+signed+by+the+yankees&um=1&ie=UTF-8&sa=X&oi=product_result_group&resnum=1&ct=title

[gordiano]

I wonder what my Ronnie Coleman autograph is worth?