Wikipedia:
The IS-3 (also known as Object 703) is a Soviet heavy tank developed in late 1944. Its semi-hemispherical cast turret (resembling that of an upturned soup bowl), became the hallmark of post-war Soviet tanks. Its pike nose design would also be mirrored by other tanks of the IS tank family such as the IS-7 and T-10. Too late to see combat in World War II, the IS-3 participated in the Berlin Victory Parade of 1945, in the border conflict during the Sino-Soviet split, the Soviet invasion of Hungary, the Prague Spring and on both sides during the Six-Day War.

During the Six-Day War which began on June 5th, 1967, Egyptian IS-3s along with other Soviet supplied tanks engaged Israeli armour.
IS-3 tanks were included in the Egyptian 7th Infantry Divison, which took up defensive positions along Khan Yunis-Rafah line


Dimensions:

Hull length: 6.9m - 9.85m with gun
Width: 3.15m
Height: 2.45m


Ingame:

Hull length: 10 blocks - 15 blocks with gun
Width: 5 blocks
Height: 3.5 blocks
Scale: 1.5:1