The Laurence Pope Collection of Portuguese Colonial Banknotes - Part One
Banco Nacional Ultramarino, Portuguese Guinea, obverse and reverse die proof 2$50 Escudos, 2 January 1945, obverse showing top print only, reverse complete types annotations in margins, mounting traces, otherwise good extremely fine to about uncirculated and very rare
BNU PG37dp, Pick 26p £300-£360
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These are the BNU plate notes