This seems quite an exciting find, if you have GBP 13,000 (about $17,333) to spare.  The dealer is pretty reputable, so I take it as a genuine sale
www.bassdirect.co.uk/bass_guitar_specialists/Alembic_Series_1.html

Was this one of John's first Alembics? It presumably predates his Explorer Alembics (which I saw him playing in 1979)

There is a thread elsewhere on the forum: http://club.alembicguitars.net/index.php?topic=23718.0

This is a good place for it too though, for posterity

Apologies Hieronymous, I've just caught up on my back reading!

Quote from: piers_williamson on May 30, 2018, 11:52:32 AM
Apologies Hieronymous, I've just caught up on my back reading!

No apology necessary! Like I say, this is as good a place as any for the info, especially if someone is searching in the future.