The 75/46 M43 is a German-designed variant of the Semovente 105/25, with improved armour and using the German Pak 40 anti-tank gun in place of the original 105 mm howitzer. Due to the low production output of the Italian-licensed version of the gun, only eleven 75/46 M43 were built, while others were outfitted with the available Italian 75 mm Ansaldo L/34 gun, leading to the production of the 75/34 M43 tank destroyer. They only saw service with German forces in Italy in late 1944 and 1945. -from WT Wiki