As a late teenager in the late 70s/early 80s I once made a poster in felt tips of the Axe Victim cover skull guitar and had it on my bedroom wall. Not being a musician, it wasn't till quite a bit later I noticed I'd drawn it with only five strings! I wonder if anyone ever made a real guitar based on that image or similar ? Bit OTT but would have been a bit of fun!

Thanks for the answer. Of course it's obvious now. None of the lyrics sites ever include it.