Mexico 1758-Mo M 1/2 real
The 1758 MoM is one of a series of half reals struck 1757-60, during the reign of Ferdinand VI. Gilboy lists this date as common with the overdate 1758/7 (see the second specimen shown) as scarce. The issues of 1757-60 have dissimilar crowns atop the pillars; earlier dates have similar crowns.
Mexican numismatists hotly debate which side of the coin constitutes the obverse. Gilboy depicts the shield side as the obverse as that side bears the king's name. However, auction catalogs and dealer listings more frequently use the pillars and globes side as the obverse, as that side bears the date.
Specification: 1.69 grams, .917 fine silver, .049 troy oz ASW.
Catalog reference: Gilboy M-05-34, KM 67.2.
- Gilboy, Frank F., The Milled Columnarios of Central and South America: Spanish American Pillar Coinage, 1732 to 1772, Regina, Saskatchewan: Prairie Wind Publishing, 1999.
- Yonaka, Brad, A Variety Guide to the Fractional Pillar Coinage of Mexico City, 1732-1771, Long Beach, CA: Agorocu Consulting, 2017.
- Harper, David C., ed., North American Coins & Prices: A Guide to U. S., Canadian and Mexican Coins, 17th Ed., Iola, WI: Krause Publications, 2007.