My grandfather gave me a bat about 10 years ago. The bat was given to my grandfather when he was a kid directly from Jackie Robinson. The bat has a crack from a ball he fouled off during the game. The bat was given to him in the 1940's after a game in Boston.

Does anyone know what something like this would be worth? I was also curious how I could get this authenticated and appraised without having to send it away to someone?

thanks