Vintage Cast Iron Trade Sign Keil Charlestown NH Keys Made Advertising Sign. Details : really neat advertising piece made of heavy cast iron. Condition : very good overall condition; general wear due to age; kindly see photos. Marked/Signed : unsigned – advertising for Keil’s. Measurements: 2.57 inches tall x 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!