$1200.00
In the low 1,000s
On Amazon, Vin Scully autographed baseballs can go for as much as $295.80
Willie Mays single signed BaseballA Willie Mays single signed baseball is worth about $125.-$200. Value is based on average prices of recently closed auctions. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been properly authenticated could sell at half the market value or less. Add for inscriptions.Collectors will pay more for inscriptions like 660 HR or HOF, and pay less for personal inscriptions like "Good Luck Julie" If this is what you mean by "signed it as Julie Troop" The value would most likely be cut in half or less. A Willie Mays signature is too common for someone to pay top dollar for a personalized signature.
About $1,000 to $3,000
Willie Mays Signed Baseball CardA Willie Mays autographed baseball card is worth between $50.-$100. Prices may vary based on condition, and the type of authenticity that accompanies the signature. Signatures that have not been authenticated could sell at half the market value or less. In general, collectors of baseball cards would rather have a baseball card without the signature. The signature would be considered as a flaw in the condition of the card and will lower the value. If the signature has a lower value than the card it will lower the value of the card. The un-signed card will have a higher value.
Close to $300
$50
$800,000,000
Anywhere from $20 to $40.
The autographed baseballs are valued at a price between $40 and $60. The exact price will depend upon the condition of the baseball and when it was signed.
I would estimate $25.00 - $50.00