Haven't opened the case yet (due to not owning the screwdriver necessary to for a while now), but this appears to be a prototype Macintosh with the original 5 1/4" twiggy drive still intact. The only other one I've found to exist on the internet has had the Twiggy drive replaced with a 3.5" one. It powers up to a normal blinking Mac floppy symbol, but I don't have the floppy discs to boot it from. Really curious to see what's inside it when I get the proper tool. I got a prototype keyboard with it too, no mouse though.