Here's a more recent, side-on photo of Jimmy Mullen that doesn't look anything like him
(it looks more like Bob Willis). I know someone said earlier that it's all in the chin and, as in the original picture, there's an unusual ) type curve from under the nose to the end of the chin so it could well be the same person.
http://www.leaguemanagers.com/managers/jimmy-mullen/
I'm glad I'm not friends with him because every time he turned his head I'd be saying 'where's Jimmy?' and he'd say 'I am Jimmy'. I'd feel such a ninny.