Caterham Cars have confirmed that the the sales invoice for the car, a Super Seven Series III, is dated May 1, 1974. They also told me that the car was supplied to a customer in Yorkshire, England, in component form, less engine and gearbox, for the price of £1042.96 and that the customer was about to move to New Zealand. This confirms the information in the "Skidding the Tyres" book.