Here is a group of four US Army military brass collar pins. Three are the round circle disc pins, the fourth is a US block letter pin. All four are in very good condition with minor wear. The discs are 1" wide, the initials pin is 3/4" wide. The round disks are for and enlisted man's collar. The US one is for officers. These went on the right side of the uniform, while an infantry, artillery, armor, etc. disk would go on the left side.