This paper model is an Object 279, a Soviet prototype tank designed in 1959 to be capable of operating on a nuclear-biological-chemical battlefield and even survive the blast wave from a nuclear weapon.
The Object 279 tank had a bowl-shaped body to channel blast energy away from the vehicle. The vehicle carried a 130mm main gun capable of firing discarding sabot shells that could penetrate over 400mm of armor. The tank's own armor was up to 319mm thick. The tank had four tracks in order to assist it in going over exceedingly rough terrain. In spite of its advantages, the tank was never put into production due to issues of reliability of the gearbox and its inability to cross some bridges and move in swampy areas due to its weight.
Object 279 was armed with a 130mm main gun with a muzzle velocity of 1000 meters per second. The gun could fire a discarding sabot projectile capable of penetrating 450mm of armor at optimum range and impact angle. The tank also carried a 14.5mm machine gun. [Source: wikipedia]
You can download this tank paper model here: Soviet Object 279 Experimental Heavy Tank Free Paper Model Download [DropBox]