cover 1925 "red band" envelopes (3) frum Urga with 5c. + 10c. to Kalgan, 5c. + 20c. to Kalgan, 5c. + 5c. (underfranked) to Kalgan, 1925 registered envelope from Urga to Moscow with 50c., 1926 large part registered envelope from Altan Bulak to Urga with 10c. strip of four, 1926 registered from Uliasutal to Urga with $1 and 1927 large part registered envelope from Ulan Bator to Leningrad with 5c. block of four (perf. 13½), 10c. and 20c.