Green. Looks like minimal rust. 50 dollars for new tank and you got. 100 dollar performer.
https://sfbay.craigslist.org/eby/for/d/weber-charcoal-bbq-grill-with/6293210051.html
https://sfbay.craigslist.org/eby/for/d/weber-charcoal-bbq-grill-with/6293210051.html