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Specifications originated in 1942 calling for a heavy assault gun with 100 mm armor. Guderian was against the project as it took away from the PzKpfw IV tanks. A wooden model, made by Vomag Betriebs of Plauen/Vogtland, was shown to Hitler on May 14, 1943 and a soft steel model was presented to Hitler in October 1943. The final prototype was made in December 1943.