[Highland Park] Any baseball experts out there?

Hi Neighbors! I have a baseball that is covered in signatures that I'm trying to do some research on to sell for a friend. I'm actually not looking for someone to buy it right now, but rather someone who can take a look at it and tell me what I've got. There looks to be seven signatures on it as well as two official looking stamps. Is there anyone out there who can help me out or would know of someone who could? I'll bring it to you. Thanks in advance! Rachel