Mexico City, Mexico, 4 reales, Charles-Joanna, "Late Series," assayer L to right, mintmark oM to left (oM-L), encapsulated NGC AU 50. Nesmith-90; S-M9; CT-85. 13.55 grams. Broad flan with full details (just a couple minor weak spots), beautiful rainbow toning, hairline edge-splits and a few old scratches. ($600-900)