Circa 1920s: This 24"L x 9"H porcelain No Smoking sign is signed by Chicago, Illinois' Enameled Sign Company and would have hung by the pumps in an old gas station. This early enamel sign has typical chips around the hanging holes and the outer edges, but there are no chips interfering with the bold lettering. This is a nice, clean piece of antique petroliana from the early 20th century.