It cannot be the Helldiver....the question states that only two countries operated it. The Helldiver was flown by Australia, Greece, England, Italy, France, Portugal, Thailand, and the US. It was retired in 1959, the last examples were in Italian service. But according to the question, this aircraft was retured as obsolete right after the war. Even in US service, it was frontline until 1947m and in Reserve service for three years after that. The question said that only two remain today, but there are at least four Helldivers preserved around the world, and currently at least five are in restoration. As recently as 19 December 2011, a Helldiver was located by divers off the coast of Florida.