1944 Rock Island Arsenal mechanism recognizer, made of copper with age-related deterioration. Apparently, it's quite rare. The first and second photos are of the item. The third photo is an image of it in use. I did a little research and it seems like it was attached to tanks and the like. - Mechanism Recognizer - Manufacturer: Rock Island Arsenal - Year: 1944 - Material: Copper The item will be shipped as is, with oil, dust, dirt, etc., so please understand this before purchasing. Thank you for viewing. Military US Army Weapons Airsoft Survival game America Antique War Collection Surplus