Spark Plug - Rustic vintage spark plug sign printed directly to a distressed wood panel that has knots and other imperfections. We end up printing right over these imperfections which gives each sign the look and feel of a real vintage sign. No two are the same! Often people ask us "Are these originals?" All of our signs can be customized making each vintage sign personal and original. Each designed in the style and look of a historical period using different font styles, colors, and vintage layouts.