The Laurence Pope Collection of Portuguese Colonial Banknotes - Part One
Banco Nacional Ultramarino, Portuguese Guinea, colour trial 500 Escudos, ND (1958), serial number B000000, red SPECIMEN overprint and two cancellation holes, specimen number 19 on reverse, in PMG holder 66 EPQ, gem uncirculated and very scarce
BNU PG50ct, Pick 39ct £200-£260
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This is the type without security thread