俄罗斯《集邮》杂志2006年11月号刊载的“邮票上错误”一文中指出:半个世纪前,1950年12月1日中国人民邮政发行的《中苏友好同盟互助条约签订纪念》邮票(纪8),全套共3枚,图案是中苏人民友谊,但邮票图上的苏联国旗有明显的错误——镰刀与锤子印成“镜面对称”的错误(图1,右下角左图是错误的;右图是正确的)。 Russia’s “Philately Magazine” published in November 2006 issue of “Error on Stamps”: “Half a century ago, on December 1, 1950, the People’s Post issued the” Sino-Soviet Treaty of Friendship, Alliance and Mutual Assistance Treaty “in commemoration of the stamp (No. 8), a full set of three, the pattern is the friendship between the people of China and the Soviet Union, but the Soviet Union flag on the stamp chart has obvious mistakes - Sickle and hammer printed as ”mirror symmetry" error (Figure 1, lower right corner of the left Figure is wrong; right is correct).