50 Pesos

Pick 65 spans a five-year run during which Banco de México was still printing its own notes in-house — a practice the central bank maintained well into the modern era, giving it unusual control over production schedules and security specifications. The watermark on this series is relatively undemanding by international standards of the period, reflecting the bank's confidence in the difficulty of obtaining authentic Mexican cotton-fiber substrate rather than in the complexity of the security element itself.

Notes from the later dates in the run, particularly 1977–1978, circulated heavily during a period of mounting peso stress ahead of the 1976 devaluation and its inflationary aftermath. High-turnover circulation took a visible toll on survivors.