Yes, according to our records it is chassis 442 and the other one we know of is 1618 - i.e. 588 cars later because chassis only used even numbers. Chassis numbers have no "C" despite what you can find online.
As I wrote, DSJ was credited with the body shape. I had an article from "Motor" or "Autocar" about C&W and the car which I can't easily find but must be somewhere.