[LMH]

Mark I and Mark II came into usage shortly after production of the Cobra ceased. The story as I heard it was that an employee of AC Cars used the designation while trying to get the correct replacement parts to a customer. He made it up on the fly sort of thing. The terms weren't applied to cars during production period. The Cobra 427 was originally called the "Cobra II" but Shelby didn't like the term.
Larry