I've seen colour pictures of Ju87 Stukas during the very early part of the Polish campaign (so the photo caption said) wearing shark mouth designs on their grotesque radiators. They were (i think) 'A' model Stukas, they had the 'trouser' legs instead of the wheel spats seeen on the B models that we normally see pictures of. Maybe 112 SQN copied that? I dont suppose there's a lot else you could paint on a large radiator without it looking demented.
Kerms