Vintage Gas Monkey Garage Porcelain Sign. This vintage porcelain sign is a must-have for any automobile enthusiast. Featuring the beloved character Grease Monkey, this sign is made of durable porcelain and has a colorful design that will add a nostalgic touch to any collection. Perfect for display in a garage, man cave, or any other space, this sign is sure to be a conversation starter. Vibrant black & red color and excellent porcelain.