INERT DEACTIVATED. British, WW2, 1942 Dated, Strippable, No 199 Mk IV Time Fuze For The British 3.7 Inch Anti-aircraft Gun. - O 2122 INERT DEACTIVATED. British, WW2, 1942 Dated, Strippable, No 199 Mk IV Time Fuze For The British 3.7 Inch Anti-aircraft Gun. - O 2122 Other Ammunition