COLOMBIA. Lot of (2) Banco de Colombia. 50 Pesos, 1881. P-S387p1 & S387p2. Front & Back Proof. PMG Choice Uncirculated 63 EPQ & Gem Uncirculated 65 EPQ. A Front and Back proof pairing for this 50 Pesos design. The Front Proof is in a CU 63Q grade, while the Back Proof is in a GU 65Q grade.