In late 1940 two prototypes were built (called Object 150 and KV-220) armed with a 85 mm F-30 gun and three 7,62 mm DT machine guns. Ammo load was 91 x 85 mm rounds and 4.032 rounds for the MGs. It had a total weight of 63.000 kg and its maximum speed was a slow 33 km/h. In the picture above the gun looks underdimensioned compaired to the big heavy turret.
Notable: seven wheels, one more than the other KV-versions (1 and 2) which, despite their numbers, came into production later.