The IS-7 wasn't the only Soviet post-war super-tank. The Chelyabinsk Kirov Factory worked on Object 705, with similar characteristics, but a rear turret.
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Via Yuri Pasholok.
Object 705 turret and 122 mm BL-13 gun
Object 705 profile area calculations
Aside from the original 65 ton design, ChKZ also had a 100 ton Object 705A in store, but we all know what happened to Soviet heavy tanks over 50 tons.
Via Yuri Pasholok.