MEXICO. Mint Error -- Off Metal Strike, Struck on Aluminum-Bronze Planchet -- 20 Centavos, 2018-Mo. Mexico City Mint. PCGS MS-65.
KM-935. This aluminum-bronze 20 Centavos was erroneously struck in the wrong composition from the intended stainless stain planchet typically seen. Undoubtedly the result of some planchets being caught in a bag and fed through the hopper as such an error is unthinkable to have occurred any other way.
Estimate: $150 - $300