They do sell price guides for Sports Memorabilia that feature signed baseballs. However most are out dated and the new Autographs might have changed in value. You could search eBay for closed auctions or auction archives at a number of on line auction houses. This will give you an idea of value. Take note of condition and authenticity as compared to yours.
Individually signed baseballs usually have the autograph on the sweet spot; the shortest distance between two seams. This location on the baseball is the most preferred by collectors because it is centered as to the point of view, and pleasing to the eye when displayed. The other "sweet spot" is were the manufacturing stamping is placed on the ball.
The "sweet spot" on team signed baseballs are typically reserved for the manager of the team, or and the teams most popular player. The choice of the player that signs the "sweet spot" can effect the value of the baseball.
On Amazon, Vin Scully autographed baseballs can go for as much as $295.80
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.
Many of the autographed baseballs are valued in price close to $40 each. The amount will vary depending upon the condition they are in and which team he was with at the time of the signing.
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Hank Aaron autographed baseballs have sold as high as $1,000.00. It simply depends on the condition of the baseball, as well as if it's within a glass case. It also depends on when the legend signed the ball.
Many of the baseballs are worth a price close to $30 each. The exact amount will vary depending upon the condition of the baseball.
Many of the baseballs are valued in price close to $50 each. The amount for each ball will vary depending upon their condition and how they are being displayed.
Online, Jed Lowrie autographed baseballs range in price from $50-$100. If it's authenticated, then it's closer to $100 and perhaps a little more if you get a crazy Red Sox fan to bid well and often on it on EBay.
Celebrity autographed baseballs may be obtained from some events that occur. One can purchase one from websites such as eBay, Hollywood Memorabilia, and Amazon.
No CoatingYes especially with newer baseballs. It will hurt the value of the signature. Years ago it was a common practice to shellac the baseball to protect the signatures. This practice stopped when it was realized that the balls would turn yellow, crack, and peal off. With some of the earliest signed baseballs, the value is not hurt as much as with newer balls because the autographs are more rare, and it was common.
Just start googling. Maybe you'll get the number of those people who estimate the value of items
The value of a Mark Twain autographed first edition Joan of Arc book can vary greatly depending on its condition, rarity, and market demand. In general, such a book could be worth thousands to tens of thousands of dollars, or even more at auction. It is recommended to have the book appraised by a reputable expert to determine its precise value.