Russia 3742-3744C blocks/4

Russia 3742-3744C blocks of 4 upper-left corner margin, MNH. Michel 3770, 3774, 3778, 3800-3801, 3808. 50th Ann. of the Tatar, Karelian, Chuvash, Kalmyk, Udmurt and Mari autonomus SSR, 1970. Hammer and Sickle Emblem and Building of Supreme Soviet in Kazan, Petrozavodsk, Cheboksary, Elista, Izhevsk, Yoshkar-Ola.