cover 1927-29 native envelopes (5) from Ulan Bator to Peking (2) and Kalgan (3) each bearing 25m. in combination with different "Junk" frankings, one with additional Postage Due 4c. pair + 10c., three showing "CHITA" Russian P.O. transit c.d.s.

Details
cover 1927-29 native envelopes (5) from Ulan Bator to Peking (2) and Kalgan (3) each bearing 25m. in combination with different "Junk" frankings, one with additional Postage Due 4c. pair + 10c., three showing "CHITA" Russian P.O. transit c.d.s.

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