This is only remaining B-10. It is an export version sold to Argentina
in 1938. Argentina donated this airplane to the U.S. government
for the National Museum in 1970.
Martin B-10
The B-10's first flight was in January 1932. It entered service on 20 March 1932 and was the first all-metal monoplane bomber to be produced in quantity. They saw action in the Pacific thorough 1942, until more modern aircraft could be produced.