The 'Prof', 'Mr Spitfire', the authoritative voice on all things Spitfire and Tamiya 1:32nd Spitfire kits No. 1 fan says

have a Jerry Christmas and a Jappy New Year!   This was a common saying after Japan entered WW2 where 'Jerry' refers to Nazi Germany a 'Jappy' the Empire of Japan. All this happened so long ago and now seems so unlikely to have ever occurred and yet it did. We really do live in a different world.