Hey kids...
This looks to me to be a very old (1970s)production Modulus BassStar. When Geoff Gould started Modulus, his original production went to Alembic. Simultaneously with those early through body graphite necks that they manufactured, Geoff also started building his own line of graphite Fender replacement necks, followed by his own instruments, built at the original Modulus factory in Menlo Park. This looks to be one of those.
The early Modulus necks are marked Modulus/Alembic BassStar. There was some talk of these being distributed through Alembic's dealer network (remember, back then in the 70's, there were *no* exotic basses, and Alembic had to build dealers up from scratch), but I don't know if that ever really happened. Having the Alembic name on the necks did improve visibility, and the association was definitely there. Not only was Alembic the first customer for the product, but Rick Turner, at Alembic back then, pushed Geoff to patent the Modulus monocoque neck structure and the patent bears both names. I don't know about the Lesley neck, but it looks like there's a plate where the decal logo would normally be. Over the years, Modulus used different graphite material for the outer appearance layer of the neck - this is the old stuff, on the oldest necks, and this instrument appears to have the original tuners that Modulus used as well.
The pickups are original EMGs with the embossed tops, their second design and predating their current appearance. The bridge is a Stars Guitars brass bridge, also popular at that time. Stars was a famous guitar repair/mod shop in San Francisco in the 70's and 80's. They made a lot of premium custom brass hardware. I don't know whether Alembic was ever at that location on Folsom Street (right by where Moscone Center is now), but I remember seeing Alembics there back in the day. Geoff worked at Stars on and off, and after Stars closed, this was the location of the second Modulus factory.
This one is a bolt-on. There are similar neck throughs, but the cutaways and end of fingerboard look different than this.
I've got some Modulus basses of this age. They can be very nice, but you need to be careful about neck problems - as with all older Modulus, there's no truss rod so setup and refretting are harder than wood necked instruments.
David Fung