Watch List notes:

Mexico City, Mexico, 4 reales, Charles-Joanna, "Late Series," assayer G to right, mintmark oM to left (oM-G).Nesmith-54a; Cal-127; S-M5; KM-18.13.27 grams.Very rare variety from this assayer with small o above mintmark M (only two others known, both inferior examples in the Banco de Mexico collection), broad-flan XF with virtually full legends and outer borders.
($500-750)