This WW1 U.S.N. Gas Alarm is a rare and original piece of militaria from the United States. It dates back to the First World War (1914-18) and is perfect for collectors of historical items. The gas alarm was used by the United States Navy and is a valuable addition to any collection of personal and field gear from that period. Its originality adds to its historical value and makes it a must-have for enthusiasts of militaria.