A WWI Imperial German Army machine gunner or trench assault helmet front plate (Stirnpanzer) measuring 9-1/2 inches wide by 5-3/4 inches tall by 4-1/2 inches deep. This rare iron helmet accessory weighs 6.8 lbs and includes a brown leather strap with nickel buckle. The Stirnpanzer is designed to fit the M1916 and/or M1917 Stahlhelm helmet design via mounting slots that fit the side ventilator lugs. This rare trench warfare helmet accessory saw limited use due to the excessive weight. The Stirnpanzer is in good condition.