Because you are asking the value of a Signed "Broken bat" I'm going to take it that you have a "game used" bat, used and signed by Kelly Gruber. A broken store model bat to display a signature will have very little value. The bulk of the value will rely on The provenance or authenticity accompanying the "Game Used Bat.
With out any letters of authenticity as a game used bat, with the proper bat markings as a pro bat it will only sell as such. A Kelly Gruber "broken" pro model bat. As only a pro model bat it will still have a low collectors value because it is broken. A Kelly Gruber Signed "Broken" Game used bat would probably sell for about $75. -$125.,and less without a COA for both the Game used bat and signature.
Keep in mind that most "Game used" collectors would rather have the item unsigned, and autograph collectors are looking for a displayable signature
A Ken Griffey Sr. single signed Baseball is worth about $45.-$65.
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. In a recent auction a Ken Griffey Sr. single signed baseball sold at a high of $54.00 For more prices on single signed baseball see Related Links below.
A Ken Griffey Jr.autographed baseball card is worth between $35.-$50. 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. An inexpensive card will benefit, but if the value grows in the future it will be held back by the growth of the value of the signature.
A Ken Griffey Jr. autographed baseball card is worth between $25. -$40. 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.
Collectible items could add value to the price of a signature but not always. As in the case of a baseball card, generally 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.
A collector of signatures will not always pay extra for the "collectible" baseball card. The autograph collectors main concern is displaying the signature. This is why it is not a good idea to have an expensive baseball card signed. You could devalue the price of the card, and get less for it.
Once a collectible baseball card is signed the value of the card dramatically goes down as a collectible. The card then becomes an Item to display the signature. The bulk of the value relies on the value of the signature of the player that signed the card, and how well the card displays the signature.
$1200.00
In the low 1,000s
On Amazon, Vin Scully autographed baseballs can go for as much as $295.80
About $1,000 to $3,000
Anywhere from $20 to $40.
$50
$800,000,000
Close to $300
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
$0 to negative. It may actually lower the price of the baseball.
Autographed baseball cardsIn 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.