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Pioneer Flight Cover September 28-30, 1927, 10k and 15k, complete set of two and 14k of Zamenhof issue uprated stationery envelope of 8k brown olive, sent by registered air mail from Moscow to Vienna, delivered by two connecting flights Moscow -Berlin and Berlin-Vienna, all appropriate markings and Vienna "30.IX..27" arrival ds, mostly VF
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| Scott # C10-11