I love this site but I wish you guys would quit flappin your mouth about shit you have no idea about. Its not a medical grade gas bottle for one. They prob used this with a torch to cut scrap. The bottle says civil defense on it because gas companies reuse and trade bottles and civil defense has something to do with whoever made this bottle. The truth is this bottle could have been made in the 30s for all we know, and could have been refilled yesterday. Look I hate to be like this, but quit saying shit all "matter of fact" if you really have no clue what your talking about(and I'm not ragging the people who say "maybe its a...") cause you sound like children. Really. Its every pic with you people.