Up for sale is a 1980-Mo Mexico Press and Scales peso that has minimal/light toning. The coin contains 33.625 grams of. 925 silver for a total of 1 troy ounce of pure silver. One side has a depiction of a screw press and the other side has balance scales with weight and purity. Please enlarge photos to get a better look for yourself. Please pay within 24 hours.