1931-32, 330 mostly mint stamps in singles, pairs, blocks of four and multiples, starting with three complete imperforated sets of five, including stamps with line and comb perforations, 50k dark gray blue, error of color (VLH), nice range of 10k of various shades in blocks, engraved Airship over the Dnieper Dam with different perforation and more, mainly full OG, NH or LH/hinged, F/VF (Image)

1931, 10k-1r, imperforated complete set of five, sheet or corner sheet margin blocks of four, post office fresh quality unit, full OG, NH, VF (Image)

1931, 10k-1r, imperforated and perforated complete sets of five used on two covers, first one air mail cover to Berlin, the other one cancelled on Philatelic Exhibition in 1932, sent locally in Moscow, all appropriate markings and arrival ds, mostly VF (Image)

1931, Airship over the Arctic Region, 50k dark gray blue, error of color, unfolded block of four, very light vertical gray line on the left stamps, nicely centered, full original slightly dryish gum, light traces of hinge marks, VF and scarce multiple (Image)

1931, Airship over the Arctic Region, 50k dark gray blue, error of color, used on registered flown cover from Leningrad to Italy in 1941 together with six other air post values, including Civil Aviation, complete set of five, appropriate markings and arrival ds on reverse, mostly F/VF (Image)