Watch List notes:

Lot of two Mexico City, Mexico, cob 1R, Philip II or III, assayer F to left, second assayer o to right, extremely rare. 6.54 grams total. First of its kind we have seen: two specimens from apparently identical dies but both well worn, kept together to further establish legitimacy of this unique issue that seems to prove the existence of assayer o in this period (probably related to the very rare contemporaneous assayers "oF" and "F-oD"). Both Fine+ with toned fields. (Estimate: $200 - 400)