1927 (30 Oct) registered cover from Kizil to Moscow, franked with pair of 14k on 1r, tied by cds, with additional departure cds below, arrival pmk on back, v.f. (Cat No. 12) (Image)

Est.$150

1927 18k, also 2k and pair of 4k used on both sides of cover from Kizil (19 May 28) to Harbin, routed via Minusinsk (21 May), with transit pmk on back, with single 50c adhesive added and tied on arrival in China, fine cover (Cat No. 23) (Image)

Est.$500

1927 70k, used in 1930 on registered cover from Kizil (10 Sep) to Moscow (18 Sep), v.f., with arrival pmk (Cat No. 27) (Image)

Est.$150

1928 (10 Mar) registered cover from Kizil to Moscow, franked with pair of 14k, tied by cds, with additional departure cds below, arrival pmk on back, v.f. (Cat No. 22) (Image)

Est.$150

1933 (15 Oct) registered cover from Kizil to Harbin, franked on back with a vertical strip of 3x15k on 6k orange yellow (type 3), tied by departure pmks, with additional departure and Registry handstamps on front, Harbin arrival pmk on back, fine and extremely rare registered cover to China, without the customary postage dues, signed Peter Holcombe (Cat No. 41) (Image)

Est.$5,000

1935-36 Issues, 32 apparently different perforated commemoratives and Air Post adhesives, used on 13 registered, some flown, covers from Kizil to Czechoslovakia and USA, fine-v.f., with arrival pmks (Image)

Est.$1,500