MEXICO. 4 Reales, 1842-Go PJ. Guanajuato Mint. NGC VF-30.KM-375.4. Problem free for the grade with mottled olive to gray toning. A highly coveted issue from the "PJ" assayer, listed in the emStandard Catalog of World Coins/em simply as strongRARE/strong.Ex: Richard Ponterio Collection.