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I would argue that this tank, more than any other, is the forerunner of the modern main battle tank. This was the definitive Soviet heavy tank design of World War II, and with over 4000 units built, is also the most widely produced (heavy tank, that is). This particular model is the initial development of the IS-2 was the replacement of the 85mm gun on the IS-1 with the same 122mm gun used on the ISU-122 tank destroyer, but with no further modifications, and was produced late in 1943. The more common 1944 variant is also available in my shop.
Ordering the small variant will give you a single tank.
Ordering the medium variant will give you two tanks.
Ordering the large variant will give you five tanks.