It's hard to find in the winter. You'ld never find it in the summer. The area is highly poisoned so not worth trying. I've been there twice since my post here a year ago. Oh yes, the graffiti has completely faded away.
I'm gonna put a mid 70's dating on this machine, 'cause of the 35 cent price and the 'served in cans' inscription. 60's machines were 25 cents (or less) and dispenced you a bottle. 80's machines were 50 cents and more colorful.