Harley Davidson Motorcycles porcelain license plate topper sign measures 12. This license plate topper features the iconic Jacksonville Florida dealership, perfect for showcasing your love for classic motorcycles. The topper has really nice porcelain on both sides. Whether you are displaying this sign as part of your collection in your man cave, shop, bar, or garage, or giving it as a gift, you can also browse my other auctions for more vintage gas, oil, aviation, automobile, motorcycle, and hunting signs. Harley Davidson Motorcycles License Plate Topper. Bright colors w/ porcelain on both sides.