Vintage Indian Motorcycles Porcelain Sign. This vintage porcelain sign features a Native American riding an Indian Motorcycle with a horse laying on its side. The sign measures 11 3/4 across. This sign is perfect for collectors interested in gas and oil memorabilia and advertising from the past. It is a great addition to any collection of vintage signs and would be a unique piece for any room or garage. The sign is marked with the brand Indian Motorcycles and is labeled as a porcelain gas sign. It falls within the categories of signs, merchandise & memorabilia, gas & oil, advertising, and collectibles. I have a lot of other signs you might like. Shell, Rat Fink, Harley, Chevrolet, Ford, Automotive. 11 3/4 inches in diameter, convex shape. Vibrant colors and excellent porcelain.