I bought this at an Estate Sale, it's an 1988-89 Chicago Bulls Team Ball signed by Michael Jordan, Scottie Pippen, John Paxton, Horace Grant, Bill Cartwright, Will Purdue, Dave Corzine, Brad Sellers, Craig Hodges, and Sam Vincent. Sam Vincent and Will Purdue only played together that year, so I know it's 88-89 season. You have the starting five autographs, plus five more.
It's not authenticated yet, but I don't think someone would go out of their way to forge ten signatures. You can tell all the Signatures are pretty legit, if you research the handwriting.
The ball itself is a little worn, but HELL, what a great piece to own. I had it looked at by PSA for a quick decision, but they said they would have to see it in person. This was signed by Michael, before Michael was "Michael "! Even the basketball itself is from 1988. I researched it, and it is a 1988 wide channel Spaulding. This would have to be one heck of a forgery!