Panama, proof copper-nickel clad copper 5 balboas, 1982, Bellisario Porras, error fineness "0.500" (silver), very rare. KM-40.5. 30.36 grams. Bright mirror Proof (but not cameo) with minor imperfections but no marks, scarce as from a mintage of only 200 pieces (not listed in KM in Proof). Pedigreed to the Richard Stuart collection. (Estimate: $200 - 300)