20mm South African HEI round HS.820 20x139mm anti-aircraft inert shell ammo
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Inert 20mm South African high-explosive incendiary round used in the HS.820. This 20x139mm shell casing is made of steel and is in good condition. Markings can be clearly seen. The HS.820 is a 20mm autocannon developed by Hispano-Suiza primarily for aircraft use, but more widely used in a series of ground-based anti-aircraft guns.
