Comparing: KV-220-2 vs. O-I Experimental

Development of KV-220 on the basis of the KV heavy tank started in the summer of 1940. A prototype was built on December 5. Unlike other KV modifications, the tank featured an elongated hull, additional support roller, enhanced armor (100 mm), and a new turret with the 85 mm F-30 gun. In the fall of 1941, production of the KV-1 was discontinued. The vehicle received the mass-produced KV turret and was sent to the frontlines.

Development of this superheavy tank was initiated by Colonel Iwakuro from the Army Ministry of Japan. The project was carried out by the Mitsubishi company, therefore the vehicle became known as the Mi-To. In the army, the tank was designated the O-I. Details of the project are largely unknown.