BOLIVIA. Banco Central de Bolivia. 500 Bolivianos, 20.7.1928. P-134cts. Color Trial Specimen. PMG Choice Uncirculated 64.Lovely color trial specimen from the long-running 1928 series of Bolivia, issued by the Banco Central. Produced by Waterlow & Sons in England and with a much different appearance compared to the issued notes, which were printed in dark green on pink. This example is surpassed in the PMG population report by just two finer examples.