Originally built for USN as S2F-1 Bureau Number 144720. Transferred to the JMSDF on 20 June 1959. In 1970 -1971 it was converted to a S2F-U target towing a/c. All the JMSDF S2F-1s retained the USN Bureau Number on the fuselage under the horizonal stabilizer. Sorry for the slightly blurry image.