Sweden
Oscar II gold Error 20 Kronor 1876-EB MS64 NGC, KM744. Broadstruck Error. A partial out-of-collar strike produced this lovely gold error with sharp and full design detail and a small crescent of unstruck metal at the top of the obverse. Quite rare, as are any gold errors, and as such, akin to "caviar" for those collecting the mints' mistakes.
Estimate: 1500-2000 USD