3905390 Chinese Postage Stamp Commemorating the Execution of the Sino-Soviet Treaty of Friendship in 1950, Joseph Stalin and Mao Zedong are Shaking Hands.; (add.info.: Chinese Postage Stamp Commemorating the Execution of the Sino-Soviet Treaty of Friendship in 1950, Joseph Stalin and Mao Zedong are Shaking Hands.); Sovfoto/UIG; EDITORIAL RIGHTS ONLY; out of copyright.