MEXICO. Charles IV/Guanajuato Miners Bronze Proclamation Medal, 1790. Mexico City Mint. PCGS MS-63 Brown. Grove-C-75C. By G. A. Gil. Diameter: 47mm. Obverse: Garlanded and draped bust right; Reverse: Cross-section subterranean view with miners at work in mineshafts. An incredibly attractive and vibrant mining-related medal, this Choice piece, despite its brown designation, offers some highly alluring hues of red further accentuating the devices. From the David Sterling Collection.