Watch List notes:

MEXICO. Mint Error -- Struck on a Copper-Nickel Planchet -- Peso, 2018-Mo. Mexico City Mint. ANACS MS-63.

cf.KM-603. This mind bending error is clearly a one Peso issue, usually a bimetallic strike, rendered on a copper-nickel planchet. It is unclear what the original piece was, as the Mexico City Mint produced no copper-nickel planchets in 2018 of this diameter, though it quite possibly was a 20 Centavos piece from 1974-83 that was planed down and overstruck. This "error" offers the chance at a uniquely composed Peso, and is certainly an interesting conversation starter.

Estimate: $100 - $200