1837/6-Mo NGC AU Mexico 8 Reales Cap Rays Rare Overdate Silver Coin (24052501C)Almost Uncirculated Mexico silver 8 reales coin. Rare early date struck at the Mexico City mint (mint mark Mo), assayer MM. Overdate variety: 1837 6. Certified by NGC to AU Details OBV SCRATCHED. Lightly toned with significant luster, very attractive in hand. Dunigan Mo19: "This date is very scarce. It is slightly more available than the 1837 ML. (under the 1837 ML, Dunigan notes: Along with the 1836 ML and the 1837 MM, this coin is the second rarest