100 Pesos Guanajuato - Gold and Silver Proof Issue

Part of Mexico's long-running "Places and Monuments" bimetallic proof series, this issue celebrates Guanajuato — a city whose silver mines once supplied roughly two-thirds of the world's silver output during the colonial period. The Casa de Moneda de México has issued similar state-themed bimetallics annually since the late 1990s, pairing fine gold centres with fine silver rings in a format that leans more toward collector appeal than any circulation function.

Guanajuato also holds particular significance in Mexican monetary history: the city's mines fed the very mints that struck colonial reales for three centuries.