How about this one

[EarlSchreyer]

What do you think?

https://reverb.com/item/85327784-alembic-series-1-1977

[BeenDown139]

ok i'll bite -
nice bass, looks like cocobolo top maybe, got a case and PS, "needs cleaning" (hmmmm....) can't tell what kinda shape the frets and truss rod ends are in, elsewise it appears to be all there.  hopefully long scale, looks like it.

 this one just went for $5500 USD perportedly.
https://club.alembic.com/index.php?topic=28753.0

so i'd say it's priced kinda high given what the market for used series I's is these days.  seller looks legit.  imho.  ymmv and all that rot.  tell the seller to sharpen his pencil, do yer due diligence and let 'er rip, tater chip!

[JimmyJ]

That looks pretty nice. Straight up Series I, not a Persuader as it says in the specs.  And there's been some mistake made with the way the pickups are mounted.  Not sure what's up with that.  Otherwise a fine looking machine.

Jimmy J