KV-1S-152 Heavy Tank

By the order of comrade Stalin S-41 Howitzer 152 mm caliber was designed in 1943 as an attempt to increase the firepower of tanks. That howitzer was installed in the turret of the tank KV-1S. Tests of the new tank passed in 1942. All the work on the tank was stopped in connection with entering into service of SPG SU-152 and ISU-152.