so, the first Trident Convertible (1966)?
Yes it is.
After the collapse of TVR in 1965 East Anglia TVR dealer Bill Last acquired the plans for the TVR Trident with the co-operation of Fissore and Fiore. The buck for the TVR Trident Convertible was used by Fissore to make this car, which was displayed at the Racing Car Show, Olympia in January 1966. It was to remain the only Trident Convertible as the next Trident built was the Clipper coupe shown at the Racing Car Show in January 1967; subsequent Tridents were all coupes, the Clippers having the 289 cu in Ford V8, the later Venturers the Ford Essex 3-litre V6 and Tycoons the Triumph TR6 straight six.
Starting with a very attractive design, it was uglified bit by bit down the years and was pretty ungainly by the time production ceased in 1974. In 1976 however a Chrysler-powered Trident was shown at Earls Court, and marked a low point in its design at the time, but which was actually surpassed some years later when the car re-surfaced in South Africa sporting all sorts of addenda and spoilers and purporting to be an Aston Martin DBS replica! After that it mercifully sank without trace.
It is believed this unique Trident Convertible (as opposed to TVR Trident Convertible) was taken to Australia by Bill Last when he emigrated there and it probably still exists somewhere in that country.
Here are some more photos of this interesting car: