Ah, the days of cheap matches meant you could do all sorts of gag-novelty pranks, Your buddies could come up with matches that said WHATEVER HAPPENED TO SEAN FLYNN and pass them around after you were married, because hey, what did happen to that guy? He doesn’t come around here any more.

Anyway, that’s not the case here.

He was Errol Flynn’s son. Here's the story about his disappearance.