Mexico. 4 Reales, ND-Mo O (O over L). KM-0018. Carlos & Joanna, 1516-1556. Late coinage (1542-1555). 13.74 g. Crowned arms of Castille and Lion. Reverse; Crowned pillars over waves, motto between; value below. NGC graded Extremely Fine Detail (Surface Hairlines). Estimated Value $250 - 300