COLOMBIA. Banco de la República de Colombia. 50 Pesos Oro. July 20, 1923. P-365s. Specimen. PMG Choice Uncirculated 64.A significant, higher denomination Specimen from the 1923 Kammerer series. Issued notes are very rare (there were only 80,000 printed). There were only two face and back proof pairs from the 1990 ABN sale with one of those pairs bringing over $1,300 in the first sale. Zero numbers and SPECIMEN in red. Another significant Specimen note offering and destined for a four-figure realization.