In December of 1943, Stag IV was introduced, it was essentially a slightly modified Stag III superstructure mounted on Panzer IV chassis. From December of 1943 to March of 1945, 1139 such "hybrids" were produced by Krupp-Grison at Made burg. Stag IV was armed with 75mm STUK 40 L/48 gun mounted in cast "Sauk opt" mantled.