I recently found one in worse condition. Did some research and found out it is a very sought after game. Simple to learn .. hard to master and addictive.
These often get wet on the bottom and will need a serious rebuild if so.
Backglasses are available from BGResto as mentioned.
As is you could get $400. Just get it working and your at $600. Go nuts and do all cosmetics your at $1500+
Mike V