This is a rare porcelain double-sided Cities Service Shamrock Gas sign. The sign is a collectible item and falls under the category of gas and oil memorabilia.
The sign is designed with a gas and oil theme and is used for advertising purposes. It is a unique item as it features the Cities Service Shamrock Gas logo. The sign is made of porcelain and is double-sided, making it visible from both sides. It comes with a frame, which adds to its aesthetic appeal.