one of the 90 Semovente 105/25s .It was one of the most powerful self-propelled gun built by Italy during World War II.
Semovente M43 DA 75/46. The main armament was based on the Italian Model 75/46 75mm. anti-aircraft gun and one 8mm. machinegun. They were used in late 1944 and early 1945. German designation was StuG m43 mit 75/46 852(i). It was an attempt to produce a vehicle comparable to the StuG III and StuG IV. Ammunition was 43 75mm. and 864 8mm.
Semovente da 75/46: Semovente 75/46 - Italian Forces | Gallery
The semovente da 105 is this: Semovente da 105/25 - Italian Forces | Gallery