I'm pretty positive it's actually a Gibson Grabber, they had two models the Grabber has a sliding pickup. While, the Ripper just has three pickups, I forget what kind. Also the earlier in the 70's models are more desirable because they switched the wood they used on them. But, I forget the details on that, should be able to snag one for 600-800 bucks. Awesome basses, super heavy!