Easy to print IS-2 (JS-2), 1/100 scale, will want some greebling if scaled up. Some details have been changed for looks/ printability. The shape of this is a bit of a mix between the IS-2 (1943) and "IS-2m"(1944).
Scale by 1.56 for gaslands / hotwheels / 1/64
Scale by 1.786 for 28mm / 1/56