The IS-3 (or JS-3) is a member of the imposing family of IS heavy tanks manufactured by the Soviet Union in the 1940s and early 1950s.
“The IS-3 first appeared to Western observers at the Allied Victory Parade in Berlin in September 1945. The IS-3 was an impressive development in the eyes of Western military observers, the British in particular, who responded with heavy tank designs of their own” 
My nephew charged me with building this Airfix 1/76 kit for him. I have done the Tamiya 1/35 kit before and have ambitions to redo it in the future. But, for now, I will content myself with this smaller, simpler model.