MEXICO. 8 Reales, 1749-Mo MF. Mexico City Mint. Ferdinand VI. NGC AU Details--Environmental Damage. KM-104.1; Cal-473; Yonaka-M8-49. While the dark and slightly rough surfaces of this 8 Reales piece resulted in its details designation, it is actually a rather attractive coin. Well-struck on both sides, it retains strong details and even a hint of luster under its toned fields. Despite its shortcomings, this Dollar should have no trouble attracting collectors of the series. From the David Sterling Collection.