There are no 1969 Alembic basses. Number 1 is a 1972.
Some parts of this in passing look like Alembic parts, but then, upon closer inspection, they don't really: 3-pin instead of 5-pin, peghead shape (there IS a logo(not Alembic)), hacked up brass plate, trapezoid pickups (still don't look quite right to me).
There's just alot of things that make me think this is someone's personal project, and not necessarily someone related to or involved with us.
A picture of the electronics would be revealing, I can pretty much tell my father's handiwork.