Russia – Azerbaijan: 1923 (17 June). Cover to Germany franked on reverse with Soviet Republic 1921 issue single and a block of four 5,000R in combination with Star overprint on Imperial Eagle Transcaucasian Federated Republics pair of 25k and 1R counted as 25,000R x2 and 1000,000R denominations to pay correct 175,000 single letter rate to abroad tied by BAKU date stamps. Scarce combination franking. Sc. 29 / 3, 8
