5 Pesos

This issue belongs to the period immediately following Mexico's catastrophic 1982 debt crisis, when the peso entered a prolonged inflationary collapse that would ultimately require a redenomination of 1,000-to-1 in 1993. The brass composition was a direct response to rising metal costs — earlier peso coinage in stainless steel had already been a compromise. Coins of this type circulated hard and briefly before inflation rendered the denomination effectively worthless, which is precisely why mint-state survivors are rarer than the short date range suggests.