A P-47 Thunderbolt (serial number 44-20411). Image stamped on reverse: 'Republic Aviation Division.' [stamp] Printed caption on reverse: 'P-47D-30- The Republic P-47D-30 Thunderbolt was similar to the P-47D-25, but featured the additional dorsal fin, and had special shackles beneath the wings for carrying a total of five-inch high velocity rockets, in addition to external fuel tanks or bombs. Other modifications were the incorporation of dive flaps and improved aileron control.'