Old AC Fire Ring 45 spark plug w/original box.   I'm not sure of the age but the box appears to be early AC plug.  Now I'm not sure if used or new the plug appears to have some surface oil.  Being sold as is and look at pics closely.   I do not clean vintage pieces I leave the original patina on it, so it might need a good cleaning or detailing.   I have other collectibles in my eBay store and feel free to take a look.  Once again thanks for taking a look.