20 Pesos

Banco de México contracted the American Bank Note Company for this series across a remarkably long production window — twenty years during which Mexico's economy shifted dramatically, from the post-war industrial boom of the early 1950s through the sustained growth of the so-called "Mexican Miracle," the período de desarrollo estabilizador that kept the peso fixed at 12.50 to the dollar from 1954 onward. The fixed rate held for the entire run of this type, which means notes from the late 1960s carried the same nominal weight as those from 1950 despite a very different monetary reality beneath the surface.

ABNC's intaglio work on this series is technically accomplished, as expected from that printer in that period. The paper stock is known to show foxing and toning with age — a recurring issue across Mexican ABNC issues from the 1950s, not specific to individual grades.