1927, Soyombo, 25m yellow green and black in vertical strip of three used on reverse of pre-printed cover from Ulaanbaatar to Harbin, Chinese Postage Due marking with endorsement ''T 52'', upon arrival four postage due stamps applied, all appropriate markings and arrival ds, cover is reduced at top with erased name of the addressee, still fine and scarce

1932, black surcharges on revenue stamps, 5m on 5c violet, 20m on 20c yellow brown, used on reverse of local cover from Ulaanbaatar, tied by ''16.II.32'' date stamp, minor soiling, still F/VF