Almost Uncirculated Mexico  Colonial Spain silver 4 reales coin, 13.61g.

Early shield type minted between 1572 and 1589 at the Mexico City Mint (mint mark: M, Assayer: O).

Certified by NGC to AU 55.

Superb quality: well struck and centered on circular flan with nearly complete, readable legends, including: PHILIPPVS II.

Obverse: PHILIPPVS II DEI GRATIA, shield with arms of Spain, IIII to left and M O to right.

Reverse: HISPANIARVM ET INDIARVM RX, castle and lion in angles of cross. 

Type of coinage used in American Colonies.