Mexico City, Mexico, copper 4 maravedis, Charles-Joanna, "Late Series," no assayer (period of assayer G), king's name as CAROLVS. Nesmith-4 type; Cal-31; KM-unl. 5.79 grams. Virtually round with full legends and soft interiors, VF for wear, some light scratches on reverse.
Estimate: 400 - 600 USD