I ran across a 190? flyer for The Byron Troubadours : novelty musical entertainers that included a cool Led Zeppelin-esque instrument — a double-neck combo of a guitar and a mandolin — which was called the “byrondolin.”
The Byron Troubadours, who were also known as the Magnolia Quintette, doing a multi-jam:
Jimmy Page doing a mega-jam:
So how about that byrondolin?
For more boss historical instruments, check out harpguitars.net.