C'mon guys, why would you speculate while Ken already delivered the correct answer. Both Mark King and Stanley Clarke use Series models of the body shapes and neck scales they used to get associated with.
The Signature models have been created to make the respective style of bass more affordable for the audiences. Less expensive electronics are the main feature of the signature models compared to their Series' counterparts while maintaining the general feel of the original Series instrument.
Therefore if you are referring to a Signature Mark King bass you are not referring to the actual Series II model Mark King is using but to the type of long scale model with the specific and more affordable signature electronics.
Signature in this case became the name of a new model line, in the same way as Series I and Series II are just model names and not meant to indicate these instruments would by any means be produced in large quantities on an assembly line.
Accordingly the Signature instruments are not supposed to be exact copies of the instruments of their name holders but rather the more affordable version of their more expensive counterparts, losely yet not arbitrarily connected to the basses and names of Mark King and Stanley Clarke who in turn gave their autographs for these models.
Of course you can always start with a Signature instrument and have it customized as you go, that is why you are dealing with Alembic. Unless you change the electronics you would always refer to that instrument as a Signature model, although as Dave mentioned at some point you may just call it a Custom instrument with Signature electronics.
Besides, if you like to watch Mark King play his Series bass check out the DVD section at
www.level42.com or this real player clip:
http://www.level42.com/media/video/mk_dsl_320x240.ram. Enjoy!
(Message edited by haddimudd on April 19, 2005)