Spark Plug Service porcelain sign is a true gem for any collector of automotive, oil & gas memorabilia. Measuring 17 3/4″ x 7 3/4″ and featuring a classic blue and black color scheme, this porcelain gas sign is a true must have item. Whether you are displaying 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 gas, oil, aviation, automobile, motorcycle, and hunting signs. Vintage Automotive porcelain sign. 17 3/4″ x 7 3/4″. Excellent gloss w/ porcelain on both sides.