Here's an interesting Series II (SN:75 241)
(https://club.alembicguitars.com/Images/395/19685.jpg)
Looks to have a Superfilter on board in addition to the standard electronics.
More pictures and info here:
http://www.elderly.com/vintage/items/55U-3408.htm (http://www.elderly.com/vintage/items/55U-3408.htm)
Hi Jeffrey, welcome to the group! Yes, we've talked about this very intriguing and wonderful bass before. Some previous threads are here (https://club.alembicguitars.com/index.php?topic=13068) and here (https://club.alembicguitars.com/Images/395/15001.html).
Whoops! It occurred to me after I posted that I probably should have checked for other threads on the instrument. Oh well.
That's ok; I love looking at this bass!!