Russia – Azerbaijan: 1924 (20 Jan). Registered commercial cover to Petrograd (now St. Petersburg) franked on reverse with strip of three 4 Gold Kopecks Transcaucasian Federated Republic stamps tied by rare BAKU date stamps alongside 26.1 Moscow transit and same day arrival cds’s. Possibly the latest recorded cover of this issue since the Republics were superseded by Soviet Union on early 1924. Sc. 28
