http://cgi.ebay.com/Alembic-Mark-King-Deluxe-Series-II-bass-guitar_W0QQitemZ7354073797QQcategoryZ4713QQssPageNameZWDVWQQrdZ1QQcmdZViewItem  
 
I Emailed the seller to suggest he would want to revise this ad as the bass appears to be a MK Standard - not what the headline claims.

Corrections already made.  Apparently others contacted him as well.  Here's one for the good seller file.

Strange ring around the volume control - could be a discolouration, or perhaps just a reflection of a camera flash?

It only appears in one of the images. I wonder if it is the reflection of an overhanging light or the sun. Definitely worth asking for more pictures.
 
Keith