English: Armenia 1920, large sized framed HP monogram overprint. This overprint type was introduced at Erivan (now Yerevan) in January 1920 in violet, and probably from February 1920 in black.[1] The stamp was cancelled-to-order with 'ERIVAN D -5 2.20'.
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↑Ceresa, Dr. R.J. (August 1978) The Postage Stamps of Russia, 1917-23, 1. Armenia. Part 3. The Large sized Framed HP Monogram Overprints, Russian Philatelic Desk Top Publications, Felpham, Great Britain, p. 62−63
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