there's a brief window of time when irons could have done this ( after amsterdam but before he left for asia ). if it is his then it's possibly the last thing he did. i'll try and pick up his book from the library today. i seem to remember it had some of his flyer work in it with very similar "E's".
i just shot this over to dennis king for his input. dennis was friends with rick and has a huge collection of rick's original pencils and inks. i quote " maybe, if rick was really drunk and this was on a cocktail napkin. most likely not".
agreed. it looks more like someone trying to draw like rick.