Lot of two Mexico City, Distrito Federal, Mexico, Banco Nacional Mexicano, 20 pesos front and back proofs, no date 18XX (1882). Frampton-M311p; SCWPM-S252Ap. Three POCs (on obverse only), both uniface. Both UNC; the obverse has a small stain and "1881" printer's pencil annotation while the reverse is choice with an "El Banco Nac Mexicano 1881" annotation. (Estimate: $1000 - 1500)