I don't recognize it from anywhere else, but if I was guessing I would say that's it. I bet Mica would know and Susan would remember for sure. There was a small-body graphite neck Series with a Bigsby in the Entwistle collection too. We saw it here a couple years ago, but I don't think this could be it. (I also seem to recall that one was medium-scale) Man, he's wailin' on that thing!
Stanley Clarke and John McVie had the first two Alembics with graphite necks made in collaboration with Geoff Gould, according to the history page. I don't know which one was first, numerically, or if they are even close. Just, 1976. Lotta' notable custom stuff made in '76.
When it was for sale, I remember noting John's graphite-necked Series had what looked like walnut wings and his name in pearl inlaid in the end of the fingerboard. Also had a Master Volume. (I think he must have preferred that option; all his basses have it)
Here was John's.