cover 1919 "red band" envelopes (2) from Kulun (Urga) to Kalgan bearing "Junk" 3c. strip of three and 3c. + 6c. cancelled by bilingual c.d.s. Types 4A and 4C and showing "Letter Box No. 1" Chinese c.d.s. and 1920 "red bank" envelope (opened-out) from Kulun (Urga) to Kalgan bearing "Junk" 3c. (3, faults) cancelled by bilingual c.d.s. Type E and showing "tombstone" "Letter Box No. 2" h.s. (Rare)