Watch List notes:

set of 2 different Test Notes with portrait of Charles Babbage printed by De La Rue Currency. The first type is the so-called "DPLEX 010" Specimen which is uniface printed intaglio on watermarked paper with windowed security thread in paper. The second type is also intaglio printed in lilac color on banknote paper (uniface) with the denomination "20" mentioned two times in the print. This lilac type is part of a color chart that was used by De La Rue for testing different printing techniques with different inks. Both notes are estimated to have been produced in the 1990s. Condition: UNC. (2 pcs)