Jaguar XK120 chassis ,coachwork by Barou of France circa '52/'53 ?
That is what it is, yes. Didn't think this one was quite so easy...
There are various pictures of Barou-bodied XK120's around, but they all seem to be DHCs.
This one is the only picture I've seen of a coupe, and can't find any mention of it anywhere.
Here's the unmodified puzzle picture: