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Guyana 1983, Bicentennial of Manned Flight by Montgolfier Brothers, hand-written blue overprint "PMT" (Paramakotoi Airport) over blue typo overprint "BMJ" (Baramita Airport) on butterfly stamp of 30c multicolored, full OG, NH, VF and very scarce, this butterfly stamp was printed in sheets of 25, each stamp had been overprinted in various three-letter Guyana airport codes, for some reasons "PMT" was missing in initially overprinted sheets and then very limited quantity of "BMJ" were hand-obliterated and overprinted with "PMT", Mi #1002 footnote
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