MEXICO. Australia - Mexico. 11th International Numismatic Convention Silver Medal, 1984. PCGS MS-69.
Stylized rendition of an 1810 New South Wales "Holey Dollar," with appropriate cutout and "countermarks" on a bust 8 Reales of Mexico City. The outer legends on the obverse convey the convention's information, while additional "countermarks" appear on the obverse: SNM (Sociedad Numismatica de Mexico) within a beaded rectangle and an IR monogram within serrated circle. Quite interesting and attractive.
Estimate: $100 - $200