Vintage Original Lot of 2 Automobile Service Related Signs. Dependable Champion Spark Plugs Tin Sign & Firestone Tires Sign. The Champion Spark Plug Sign has good color and gloss. It has wear, scratches, denting and some bending. It has house paint on outer edge. The Firestone Tire Sign has good color and gloss. It has scratches and wear. Both signs display well. Dimensions: Champion measures 12" x 26". The Firestone measures 10" x 25"