Original U.S. WWII B-17 B-24 Aircraft .50 Cal 30 Round Ammunition Box with Inert Rounds Japanese Guns & Ordnance This is the abbreviation for

This is the abbreviation for Manufacture Impériale de Mutzig (also known as Manufacture d'Armes de Mutzig)

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and there are a few condition issues and small issues with the wood

Twice as many of the double barreled versions were made

Original U.S. WWII B-17 B-24 Aircraft .50 Cal 30 Round Ammunition Box with Inert Rounds Japanese Guns & Ordnance This is the abbreviation forOriginal Item: Only One Available. As used by Boening B 17 Flying Fortress and Consolidated B 24 Liberator Bomber flight crew members, this is the Type 0 1, Browning ANM2 M3 30 round . 50 Cal. Machine Gun Ammunition Box (93 24673), A. S. C.# 5200090900. These were used on ANM2 Ring Carriage mounts during WWII, as there was not room for a larger box. Also included is a belt of 30 rounds of inert . 50 caliber ammunition.