Measuring 1.5" across in diameter, this button features a classic image of Captain America rendered by the king himself, Jack Kirby!  And all I can say for that background is....wow, man.  Yes, it's a little psychedelic, and maybe Cap was a little peeved when he saw it, seeing as he's not really the Hippie lover he makes himself out to be, but...hey, he'll suffer a little bad taste for the merchandising bucks, baby!