1844, Mexico (1st Republic). Beautiful Silver 1/4 Real Coin. San Luis Potosi! Mint Year: 1844 Reference: KM-368.7. Denomination: 1/4 Real Mint Mark: Pi (San Luis Potosi) Diameter: 12mm Material: Silver Weight: 0.87gm Obverse: Female bust (Lady Liberty) left, wearing phrygian cap. Mint master’s initials (SI) and assayer letters (Pi) below. Legend: S. I. Pi. Reverse: Fractional va ...