1925 native cover franked on back with 5c and 2x10c, tied by framed URGA MONGOLIA departure datestamps, with red chops alongside, also Manchuli transit and superb WAKWAN arrival pmks, with Chinese 20c brown red added on front and canceled on arrival in Wakwan, v.f. cover (Image)

Est.$500

1926 20c yellow brown, black overprint, 50c brown and olive green, black and violet overprints, three used singles, fine-v.f., with handstamp guarantees, cat. $545 (Cat No. 20a,21-21a) (Image)

Cat. $545, Est.$300

1926 50c brown and olive green, $1 brown and salmon, violet overprints, l.h., fine, with handstamp guarantees, cat. $740 (Cat No. 21-22) (Image)

Cat. $740, Est.$350

1926 50c brown and olive green, $1 brown and salmon, violet overprints, used, fine, with handstamp guarantees, cat. $650 (Cat No. 21-22) (Image)

Cat. $650, Est.$300

1926 $1 brown and salmon, violet overprint, h.r., v.f., with handstamp guarantee, cat. $550 (Cat No. 22) (Image)

Cat. $550, Est.$300

1927 red band cover franked on back with 3x5c and 10c, tied by red framed TSETSE LING MONGOLIA departure datestamps, Chinese stamp missing (was supposed to have been added on arrival in Harbin), fine (Image)

Est.$150

1927 (2 Feb) registered cover from Ulan Bator to Italy, franked on both sides, with spectacular tete-beche pair of 20c yellow brown on the front and 8x1c blue added on back, cover with filing fold away from the stamps, some toning, otherwise fine and rare usage, with Milano (24 Feb) arrival pmks (Cat No. 16,20var) (Image)

Est.$1,000