Part of my recent guitar education (think Alembic, gone Country) had me revisit this guitar deep in some old threads. There isn't a lot of information here about it, other than occasional references to the "Marmaduke Guitar". I thought it deserved its own Artist Showcase Thread in case more came along. It certainly represents some formative design that carried right on. (hat-tip to Cozmik Cowboy for posting this picture on one of those old NRPS threads)
A Brompton's article lists it as having been made in 1971, which I suppose would make it a true prototype. Note the full bird tailpiece. Dickie Betts '74 guitar, and that mystery Omega-cut guitar shared that detail. And I think Heironymous' doubleneck too? The inline pattern headstock made a comeback tour later. Lots of cool details about this guitar we see made it to production later on.
This young feller has been spotted playing the guitar a couple times in recent years. How cool that is, that someone is still playing it!
So add to it here.