Watch List notes:

Central American States, proof 50 pesos medallic coinage, 1970, 20th anniversary of ODECA, ex-Richard Stuart. KM-X1. 20.04 grams. Undamaged Proof with frosty details and mirror fields, lemon-yellow color, hallmarked "0.900" (90% fine, 0.5787 oz AGW). Pedigreed to the Richard Stuart collection. (Estimate: $700 - 1000)