Azerbaijan – Transcaucasian Socialist Federative Soviet Republic: 1923 (19 March). Registered cover to Berlin, Germany franked with two block of six 5,000 on 2,000r (one folded onto other side) and corner marginal block of six 15,000 on 5,000r surcharged with enumerator in Transcaucasian Roubles issue tied by Baku datestamps.
