1936, Dobroljubov birthday - 6 vertical strips of 3 showing gutter between 1st and 2nd row, used, Mi 548CZS 720.- for **, Zagorsky 6p (444A) USS 780 for *
1936, Dobroljubov birthday - Group of varieties with block of 8 with double perforation in middle, corner block of 8 showing plate error 1836 on position 20 of sheet and margin block of 6 showing gutter between 1st and 2nd row, 8 values showing sheet margin watermark Mi nos. 548C, 548CW(8), 548CZS(2), 548I, Mi ca. 600.-