The Škoda 305 mm Mörser Model 1911 was a siege howitzer artillery cannon produced by Škoda Works and used by the Austro-Hungarian Army during World War I and by Nazi Germany in World War II after they took over the factory. This bronze plaque commemorates the production of the Skoda 30.5 cm (305 mm) howizer cannons during WW1 between 1914-1915. The back of the plaque is marked: System SkodaWerke, Pilsen.