Watch List notes:

British Administration, St. Vincent (1797-1818), Authority of September 1811, Countermark Six-Bitts [Tariffed at 4-Shillings and Sixpence // Half-Dollar], S/VI counterstamp on cut-out central plug of an 8-Reales, 9.21g, 1h (Roehrs 281; Pridmore 12; KM 10), the host coin good to fair, the counterstamp fine, an extremely rare and seldom offered for sale, in NGC holder, graded F15 ~ C/S VF STANDARD (Cert. #5878608-001) [Top Pop]