Update...
Marty's "created" CS Convertible is # C166370, but he sold it many years ago, and it was yellow with black stripes (oops, not red).
I saw a red one with black interior for sale at a "Collectible Car" dealership in Dublin, CA, back in about 1990, but it was not a production CS, either.
In all my years of talking to people ,and research, and almost to the point of taunting people to "prove it", I have yet to see a single CS convertible with the paperwork to prove it.
I've heard of, or know about a total of 5. All were built/modified by the (then) owner.
If anyone out there (or Marti, with his data) can prove it, I'll accept it, but until then, I stand by my books, and state that there were none made at the SJ plant.
PMN