Watch List notes:

Mexico City, Mexico, 1/2 real, Charles-Joanna, "Late Series," assayer O, mintmark oM to left, o in center and o to right of monogram (oM-o-o), error with motto as S-V-P, rare. Nesmith 107f type; Cal-53; S-M10; KM-6.5. 1.64 grams. Unlisted in Nesmith, this is the third example we know of with the motto as S/V/P, the other two in a private collection and at the Banco de Mexico. Well-toned VF with clear legends where visible, it is a good choice for those looking for error coinage.
($400-600)