Watch List notes:

WORLD COINS. POLAND. Lithuania, under Poland. John Casimir (1648-1668). Gold ½-Ducat, 1664, Vilnius. AV, 1.73g. Obv. Laureate head right Rev. Horseman riding left, brandishing sword, monogram of the Treasurer below (Kop 3628 (R6); Gum 1872; Hutten-Czapski 2260 (R6); F 10). Extremely fine, edge a little irregular at places but well struck. Very rare.

Estimate: $5,000