IS-3 and IS-2
also known as Iosif Stalin Tank.
from Leningrad Kirov Plant to Berlin.
The IS-3 had a superior armour layout, with a hemispherical turret like many later Soviet tanks.
and The IS-2 had a long 122 mm gun with a double-baffle muzzle brake. This IS-2 model 1944 is recognizable by its flat glacis plate. Compare to the 'stepped' glacis plate of the 1943 model IS-2 at the top of the page.
my In-game Screenshots,
Moddb.com