This looks like a Seat 1400 by the suddenly-very-popular-on-this-forum Pedro Serra. Definitely 1950's, I'm not sure of the exact year. The 1400A was in production from 1953 to 1955 . . . I'll guess that this is a 1400B, so that would put it between 1956 and 1959.
Always glad to see more cars by Pedro Serra. While perhaps not as well-known in the US as other coachbuilders, Barcelona's Serra did some very nice cars indeed, along with some that are dramatic if not beautiful. Well worth researching.