1828-Zs AO PCGS AU 50 Mexico 8 Reales Cap Rays Silver Coin POP 1/2 (24061002C)Almost Uncirculated Mexico silver 8 reales coin. Struck at the Zacatecas Mint (Zs mint mark), assayer AO. Certified by PCGS to AU 50, Population Census: this coin, only 2 higher. Popular early date. Dunigan Zs06, "Somewhat common, but more difficult to find than the 1829 AO. It is available through Extremely Fine with occasional appearances in Almost Uncirculated."