1828-Pi PCGS XF 45 Mexico 8 Reales Potosi Mint Rare Cap Rays Coin (26022803C)Extremely Fine Mexico silver 8 reales coin. Rare date struck at the Potosi Mint (mint mark Pi), assayer JS. Certified by PCGS to XF 45. Well struck, very appealing in hand. DP Pi04: "The 1828 is very scarce to rare. This is the most difficult date of the 1828 1839 period. This coin is usually seen in Fine to Very Fine condition with Extremely Fine examples occasionally available.