I think it's a toss up between 1969 Abbey Road-era John Lennon. And 1971 era George Harrison. George started looking like one half of ZZ Top. (Check out Concert for Bangladesh and even George in the Imagine movie.) But best moustache definitely goes to Sgt. Pepper-era John Lennon. Check out the 'stache, how it extends past the mouth to the chin.
Ok, I think I have officially ruined this board. Sorry, I'm nuts. I'm going to bed. Night.



