Cuba (under Spain)
Cuba, 50 centavos, long key incuse countermark (1872-77) on a USA (New Orleans mint) seated Liberty half dollar 1857-O, PCGS AG details / tooled.KM-R5.3.Full countermark on eagle side of a well-worn US host with dark toning around details plus golden hue all over, a few old scratches and crude rims, popular and important issue from the time of Cuba's "Ten Years War" against Spain (1868-78).
Estimate: 400-600 USD