KHARKOV: 1922, cover back with 5k. perforated stamps overprinted "0250" using an enumerator, the franking at 4500rbl. is correct, as can be seen also fromi the comparison cover using onoverprinted 5k. stamps. This overprint is illustrated in Joseph Geyfmans Handbook on page 379 and classed as "doubtful", interesting item
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