Vintage Antique Brass Screw On Back-World War 1 (?) Crossed Cannons for Collar For Sale

This product is a rare Vintage Antique Brass Screw On Back, Most likely World War 1 vintage, Crossed Cannons for the uniform Collar and referrerd to as a \"collar disc\". It was worn on the soldiers uniform collar to denote the branch of the Army he was in. This crossed cannon denotes the fact that he was in the Artillery branch. The other collar was a similar disc with US on it. These collar discs came into use just before WWI. They are still used today. The item is original and unmodified, making it a unique piece of militaria collectible from the United States.