100 Pesos Counterstamped Coin

Casa de Moneda de México issued this bimetallic series partly as a showcase of domestic minting capability — the .925 silver core seated within an aluminium bronze ring demanded precise tolerances that few mints could reliably achieve at this diameter. The counterstamp program itself drew on a long Mexican tradition of revalidating coinage through official punching, a practice that dates to colonial-era necessity and was periodically revived during monetary disruptions across the 19th and early 20th centuries.

KM#963 sits in a run of commemorative-format pieces where the counterstamp functions as the primary issuing device rather than an afterthought applied to existing circulation stock.