The Martin EB-18 that RogerTVR mentioned is like an Alembic is some ways: neck through body, 4 strings, comes with tuning machines, brass nut, laminated body, so yes there are some things that are similar. And as some of you know; in addition to building guitars Alembic does also build basses.
I would not say that it was like an Alembic if I were selling it. But then again... I am not selling it.
As no-frills basses go I rather like the EB-18. They are quite playable, sell for very low prices, they sound pretty good.
An argument could be made that the people that comprise Alembics market are people that appreciate good instruments that are clearly not the most commonly seen. I think that those of us that comprise the Alembic market would be far more likily to know what an EB-18 is than most people that were shopping for a bass. In that context using the A-word in the listing makes some sense. And an EB-18 is not likily to show up in a carefully-crafted eBay search because they are so unusual.
If I were selling an EB-18 Martin. I would want it to go to someone that appreciated it. So I think that putting in a few key-words to help it appear in people's eBay searches is reasonable (to a point) given the rarity of this instrument.