That guitar is definately a puzzle. As Simon pointed out (he's been paying attention) only 94'/95' BFP's have the direct mounts (unless one of the foreign distributors ordered a batch in direct mount earlier), and if those knobs are original it would point to production to those years. Of course the plate is a 91' and the case is of 90'-92' vintage. A puzzle for sure. I'd bet the original owner changed the knobs because they were worn, and replaced the guard to enhance the condition, and since he could only get the DM guards by then, it got reconfigured.