This is a great looking 1st Marine Regiment commemorative challenge coin. Coin is about 1 9/16" in diameter. This coin has a 1st Marine Regiment insignia on front in raised lettering and the Marine Corps logo on the reverse. Coin is contained in an acrylic air tight holder. The 1st Marine Regiment is an infantry regiment of the United States Marine Corps based at Marine Corps Base Camp Pendleton, California. The regiment, sometimes known as "Inchon", falls under the command of the 1st Marine Division and the I Marine Expeditionary Force. Active 1913 – 1916; 1917 – 22; 1922 – 24; 1925 – 31; 1941 – 49; 1950 – present