Vintage Spark Plug Porcelain Sign Bosch AC Delco Rentz Firestone Atlas Red Seal Gas Oil. Please view all pictures well for they are part of the description. SIGN MEASURES 10″ FROM THE TOP OF IT TO THE BOTTOM OF IT X 5″ FROM ONE SIDE OF IT TO THE OTHER SIDE OF IT. SIGN HAS 2 HOLES FOR HANGING IT UP WITH. Sign has porcelain chipping, rust, dings, fading, and scratches. Great addition to any collection or man cave.