Alan Watson of Auckland built the original Ching during the early 50s. Later starting with this body style he and three friends would mass produce a car, which is clearly an evolution, called the F10 special. (See NZ Cars – A Cottage Industry and previous page) Alan sold this car which was just called a special to Noel Ching of Nelson in 1955. It is believed that a further four or five cars were made by Noel over the next three years.
Unfortunately I was not able to unearth enough information to include it in my book but your car may be the third or fourth that is still in existence. Pretty amazing for such a rare car.
Below I have attached pictures I have of others.