Thanks.
However, despite Googling every single word of information we know about this car I have failed to find your image on the 'Net.
Google offers different pictures depending on which country you're in so it's possible it will just never pull up your photo in the UK.
I suppose it's possible the photo was taken at Watkins Glen, probably around 1958 or 1959.
However, what I have found points to the fact that the car pictured is probably Siata Daina Gran Sport Roadster Type A, chassis no. 0216 A, which was imported by Ernie McAfee of Hollywood, CA. It was later sold to a Colonel from Dayton, Ohio and was fitted with a 265 cu in Chevrolet V8 in the 1950s. This engine seems to have stayed with it until 1972 when it was replaced by a Ford 302 V8.
The car was extensively restored in 2014, when it was re-fitted with a Fiat Siata 1400 cc engine and Borrani wire wheels replaced the original disc wheels in preparation for the car's entry into the Mille Miglia in 2015.
This car was For Sale in the UK at Vintage and Classic Cars in 2016, registered 278 YUB (a number of the type allocated to older imports or cars re-registered for any reason).
If this isn't the answer you're looking for then I don't think it's possible to find out anything else about it from the UK without more information to start with.