Interesting puzzle about the history of that guitar. I would have guessed BecVar just because his instruments had more of this kind of knobby look. The Oasis connection looks possible from the back though.
I don't know if any of you guys are old enough to remember this, but there used to be a distribution/sales rep company called Rothschild in the 70's. They distributed Alembic for a while and Oasis as well. I remember seeing them in the same catalog back around 1980 at Leo's Music in Oakland. At that time, a Series Alembic must have been around $2800 list (I think the Distillate had only been out for a short while so not everything was a Series!). Oasis was quite a bit less exotic and expensive (but still exotic and expensive) at around $1600. I can't remember if they came from Sacramento, CA or somewhere in Washington.
Geoff Gould (Modulus founder) has often mentioned that he remembers the first NAMM show where Alembic had their own booth. They had already been producing instruments and had very visible clientele, but when the first showed a product line, it blew away the show. Everything about the bass was totally different - laminates construction, exotic woods, active electronics, all that brass. This was dropped into a world of bolt-on Fenders and Gibson EB-3s. It sounds like it was a mob scene with people coming by just to see what could make an electric bass be worth $1700 and shaking their heads in amazement as they walked away. Every detail was photographed, and copied by the next NAMM show. The only other time he remembers quite such a stir was when the Steinberger bass first took off.
Hey Mica, go make your mom and dad write about that first Alembic booth. Your dad is too modest to talk about blowing people's heads off but that doesn't mean we don't want to hear about it!
There have certainly been a lot of knock-offs, including slavish copies (the Fernandes - I think Leo's had one which they referred to as the Olympic), and inspired-by instruments like Jaydee and Ibanez. I think the problem with swatting down all these cloners is that Alembic was not a gigantic company, so the legal pursuit of these guys probably wasn't possible or practical.