Watch List notes:

Callao, Peru, large silver medal, 1870, Callao harbor dam. 70.89 grams, 51mm. Obverse shows a birds'-eye view of the Callao harbor dam and reverse shows a long inscription (listing the chief engineer and President Balta), commemorating the inauguration of the dam on June 6, 1870. AU with light hairlines, attractive rainbow toning at rims.

Estimate: $150 - 225