Banco de Cabo Verde, specimen colour trial 500 Escudos, 20 February 2006, serial number AA000000, olive green and brown, Frederico/de Burgo signatures, chemist Roberto Duarte Silva, minor elements of design and security features differ from the issued note, uncirculated, a previously unrecorded specimen, the first example to be offered at auction, rare and interesting
TBB B213ct, Pick 69cts £500-£600