What is the value of a broken bat autographed by Kelly Gruber?
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 1991 Upper Deck Kelly Gruber card number 44 has a book value of about .05 cents in near/mint -mint condition. Professionally graded cards will sell for more. Condition is important. Common flaws with baseball cards include: rounded edges, creases, off centered, and faded color. Any or all flaws will devalue the card significantly.
The value is always in the eye of the beholder. That being said ... i am looking for one too for my sports room. I recently bought an autographed Wayne Gretzky officially autographed jersey for $600.00 ... and he is the best in history (so far). I wouldn't pay more than $200 for an autographed Bosh jersey. You just might have to look for a little while.