If you may be interested in acquiring this piece. I bought it in ~2010 from the original owner "Gerard de Marigny", custom made for him. You can see his custom inlay in the bass headstock. You can see this piece on the Alembic Historic Pictures page, here (at the bottom left). (they spelled his name incorrectly in the writing on the photo.
alembic.com/family/history_pictures.html
I have attached some pics, let me know if you may be interested and we can talk . This is legit.
There is a clip of me playing it on you tube also.

A few more facts:
Serial number: 80 1662
Everything works and sounds great. The power supply and cable are new also, obviously. The original cable came with it (it will be in there), but never even tried it, no original power supply. You can use 2x 9V, but burns through them pretty quickly.
After I bought it, I had it sent to Alembic. They went over it and made sure everything was good and back to original. One pick up was replaced. The two small silver switches in the front do not do anything, I guess they had made some mod back in the day, but I had Alembic restore to original Series I electronics and those switches do nothing. You can also connect Gerard directly for authenticity if you like.

I purchased a stand custom made for it recently (last pic). I'll include it.

Note, the road case is large and heavy.