Developed in 1945 on the basis of the IS-2 and IS-3 vehicles, under the supervision of Joseph Kotin. One of the distinctive features was the slope angle of armor plates. Passed trials successfully, but never entered service.
Commander
Radio Operator
Object 704
V-11 (704)
R-113
152 mm D-4S (704)
Object 704M
V-2-54IS (704)
152 mm BL-10
Characteristics are specified for vehicles with crews trained to 100%.