This is an excellent original period piece. For use in the ball turret like that of the B-17.The item "WW2 US Army Air Force USAAF Sperry Ball Turret Hand Control Unit Trigger" is in sale since Monday, October 7, 2019. This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\United States\Field Gear, Equipment". The seller is "steviewonder2002" and is located in Santa Rosa, California. This item can be shipped worldwide.