In the period following World War I, many companies used 5- and 6-inch parking/traffic signs to advertise products. One of the most well-known was Arcade Manufacturing in Freeport, Ill., which made a range of cast-iron toys and household devices, from coffee grinders to Christmas tree holders. They also made a lollipop-style Dont Park Here round sign, but the base read, International Harvest Hat Company Saint Louis USA. Another similar example is made of brass with a four-digit phone number. Another copper lollipop sign reads, No Parking Here, with the inscription at the base, Greenduck Metal Stamping Company Chicago Mastercrafters in Metal. Other unusual small signs are engraved Max AMS Machine Company-New York City-Automatic Machinery for Cans and Containers. These signs are vintage relics of a mostly forgotten past, typically cast-iron, copper, brass and a half-foot in height. They are heavy with distinctive elements and were purchased by the author to complement 1920s Buddy L trucks, busses and other industrial equipment. Whether these signs are displayed by themselves or alongside these great American toys, they serve as a reflection of a forgotten industrial America. Allan Rosenblum is a collector in New York City and longtime reader of Antiques & Auction News.