Inert 20mm Swedish armor-piercing round used in the Hispano-Suiza HS.404 during WWII. This 20x110mm round is in good condition, and has a shell casing made of brass. Markings can be clearly seen. The HS. 404 is an autocannon originally designed and produced by the Spanish/French company Hispano-Suiza in the mid-1930’s. It was widely used as an aircraft, naval and land-based weapon during WWII.