It is worth between $7000 and $9000 depending on the quality of the autograph.
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A Ricky Henderson single signed baseball is worth approximately $130 if it is on a Rawlings Official Major League baseball and is signed on the "sweet spot". These values assume that they are all authenticator by a reputable company. An autograph that isn't properly authenticated can be worth as little as half of the value of an authenticated signature. For other autograph values please see the below link.
The best thing to do is go to an autograph show, like Washington Historical Autograph show (held in December every year) where there are several dealers who can share their opinions with you. www.autographshow.info
I have a team ball signed George Anderson. I still do not know if it is real yet though. So if any one can answer this question let me know too please.
1979 NHL ordered all new players to begin wearing helmets, however prior players who had signed the waiver before this date were allowed to choose. So over the years after 1979 the number of players allowed to NOT wear a helmet decreased due to the older veterans leaving the game. The last person to not wear a helmet in NHL was Craig MacTavish in 1997. He played for the St. Louis Blues.