SCOTLAND, Countermarked coinage. Renfrewshire, Greenock. J. McK(elvie?) & Son. AR Four Shillings Sixpence (39mm, 27.01 g). Struck early 1820s-1827/8. J·MK & Son/ GREENOCK around 4/6, all within dentilled border on a Mexican 8 Reales dated 1821 Zs RG. For countermark: Manville p. 114, 58; For host: KM 111.5. Countermark VF, Host Coin Fine, toned.