Scarce High Grade PCGS 67. Pure silver 0.999. High demand 1983 Mo coin. The 1983 Silver 0.999 Onza Mexican Libertad coin is a highly sought-after collectible from Mexico, featuring a purity of 0.999 silver. With a grade of MS67 from PCGS, this coin is in pristine uncirculated condition and showcases a beautiful blast white color. This coin, with certification number 526438.67/4521151xx, is a valuable addition to any coin collection, especially for collectors interested in Mexican coins and those looking for high-grade, rare pieces.