First Flight "Dobrolet" Cover on-line "Moscow - Irkutsk"
September 19, 1928, registered cover franked by three values, tied by Moscow "17.9.28" postal marking, violet Dobrolet cachet on reverse, Irkutsk "22.9.28" arrival ds, then forwarded from Irkutsk to Moscow on November 9, 1928 with "22.11.28" Moscow backstamp, mostly VF and scarce round trip cover
