This vintage 1950’s Diamond Shamrock Porcelain Sign is a classic piece of advertising memorabilia from the Shamrock Oil and Gas Corporation. The sign features a green color scheme and a gas & oil theme, representing the era of the 1950’s. Made in the United States, this original sign is a collectible item that would make a great addition to any vintage decor or gas station memorabilia collection. Its 12 size adds a sense of nostalgia and charm to any space it is displayed in.