1830/20-Mo NGC AU 55 Mexico 8 Reales Rare Overdate Silver Coin POP 1/1 (19032901C)Almost Uncirculated Mexico silver 8 reales coin. Struck at the Mexico City mint (mint mark Mo), assayer JM. Very Rare overdate variety: 1830 20. Certified by NGC to AU 55, Population Census: This coin, only 1 higher. Rare in any grade!! Well struck with original golden luster, 3 2 overdate is bold. Dunigan Mo09: "Rarity: The overdate is very rare. Condition: Generally found in Very Fine condition, it is often found better struck than others of this