1 Peso Pattern, SUD, Stainless Steel, non-magnetic

Pattern coinage from Casa de Moneda de México in the mid-1980s was largely driven by the catastrophic inflation following the 1982 peso crisis, which forced repeated revaluation and the urgent evaluation of cheaper base metals for everyday circulation. This particular stainless steel trial — non-magnetic, distinguishing it from the magnetic variants tested concurrently — reflects the mint's systematic material testing before committing to production specifications. The distinction between magnetic and non-magnetic stainless alloys was commercially significant: vending machine and transit infrastructure required predictable electromagnetic properties.