A desirable type, featuring the final date for the design. Likewise, A/6 is the final prefix for the design as well. This is a curious Specimen, initially created by Bradbury, Wilkinson & Company, but overprinted by Thomas de la Rue. In 1986, Thomas de la Rue purchased BWC, with 1990 being the final year of operation of the famed printing firm. A high quality Specimen from an era of transformation in banknote printing.