MEXICO. 4 Reales, 1868-Zs YH. Zacatecas Mint. PCGS MS-62 Gold Shield. KM-375.9. Warmly toned with faint hints of iridescence deepening along a section of the rims, this is a truly exceptional representative of a SCARCE denomination in the Cap & Rays series, and downright RARE in a Mint State of preservation.