Commercially produced from 1949 to 1951. The new cast hemispherical tower – with a narrow porthole, “Zaman” saved only in the rear part. One exchange machine gun SG-43 in the front hull, in the control room, instead of two, placed on the fenders. New anti-aircraft machine gun turret. Changes in the units of the power plant and transmission. Tank a nozzle heater, air cleaner with ejector dust extraction, track width 580 mm (instead of 500 mm). VFD thickness reduced from 120 mm to 100 mm. The combat weight of 35.5 tons.