An XP-47H, a prototype variant of a P-47 Thunderbolt (serial number 42-23297). Image stamped on reverse: 'Republic Aviation Division.' Printed caption on reverse: 'XP-47H- The Republic Xp-47H was specifically constructed as a flying laboratory for testing a new HP 2,500 hp Chrysler Motors liquid cooled inline engine. Only two of these "Thunderbolts" were built, having been converted from two P-47D-15's with major modification to enable them to house the new Chrysler engine.'