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Not sure that I've ever seen a galvanized barrel, but they may exist. Rub your fingers on the metal. If you get a light grayish silver residue on them that would be galvanized. This isn't a definitive test though.
I think I figured out what I have after doing some research. Every barrel created is suppose to have a UN mark on the lid. I found a site that shows you how to read the UN mark so you know exactly what kind of barrel you have and the year it was made (http://www.labelmaster.com/un-markings).