A window into the inside of an SG

Here's what must likely be a rare Gibson SG. It features an extended pickguard recessed into the front of the body and which is made of perspex through which you can view the guitar's inner workings in all their glory! I'm guessing that the guitar must be a promotional model for sales shows, etc. Prospective buyers may like to know that the guitar comes with a second pickguard with a white marbled finish (and not at all transparent).

UPDATE: I'm told that it's a former Gibson "Guitar of the Month" limited edition on which someone has switched the pearloid scratchplate for one of clear acrylic.