^Lot 732 MEXICO, Mexico City, 4 reales, Charles-Joanna, "Late Series," assayer S to left, mintmark oM to righ

MEXICO, Mexico City, 4 reales, Charles-Joanna, "Late Series," assayer S to left, mintmark oM to right (S-oM), extremely rare. Nesmith-78b; Cal-129; S-M8; KM-18. 13.19 grams. A rare variety from an already rare assayer as it is only the fifth S-oM we have seen, and certainly the nicest, XF with bold legends around a full flan, slightly weak interiors with a few stress cracks here and there.