This is a rare and authentic piece of Vietnam War memorabilia. The US ERA ARMY M17A1 Gas Mask Hood Instruction Book & Carry Bag, L is a must-have for collectors and enthusiasts of militaria. The item is in its original and authentic state, with no reproduction or duplication. The Conflict aspect of this item is Vietnam (1961-75), and it was manufactured in Vietnam. The item is personal, field gear, and falls under the categories of Original Period Items and Vietnam (1961-75) Militaria. It is a unique piece that will make a great addition to any collection, and it comes with its own carry bag for safekeeping.