Vintage Cast Iron Trade Sign Keil Charlestown NH Keys Made Advertising Sign. Details : excellent trade sign. Condition : very good condition; general wear; kindly see photos. Marked/Signed : unsigned, advertising sign. Measurements: 27.5 inches long, 11.5 inches wide. Dates to : mid 1900s. Please reach out with any questions or offers. We are always around to chat. Check out all Brooklyn Artifacts items here!