Spanish "Piece of 8" silver eight Reales minted 1821 in Zacatecas, Mexico during the reign of Ferdinand VII.
Obverse: Bust of Ferdinand VII, dated 1821 below; legend FERDIN VII DEI GRATIA surrounding.
Reverse: Crowned Spanish Arms, legend HISPAN ET IND. REX , Zacatecas mintmark, denomination 8R , assayer's initials RG surrounding.
Measures approximately 36 mm in diameter