BOLIVIA. Banco Nacional de Bolivia. 20 Centavos, 1875. P-S197p1. Front Proof. PMG Choice Uncirculated 63. Proof 1. Printed by ABNC. La Paz. An exceptionally detailed front proof of this 1875 Banco Nacional 20 Centavos. With Muestra overprints. Arms and a mountain scene at center. The only Proof 1 example on PMGs population report. A charming note with the famous blank vignette.