Bolivia 1768-PTS JR 4 reales
This is one of a series struck 1767-70 during the reign of Charles III (1759-88). Gilboy lists the date as "rare" with several varieties recorded.
The pillar four reales is somewhat rare although all dates are available. In 1771, milled coinage was suspended at the Potosi mint in favor of the resumption of cob production. The mintmaster was rebuked for this and forced to return to milling coins in 1773 with the introduction of portrait coinage.
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.
Recorded mintage: unknown.
Specification: 13.54 g, 0.917 fine silver, 0.39 troy oz ASW.
Catalog reference: Gilboy P-4-2e.
- 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 Pillar Coinage of the Guatemala, Bogota, Lima, Potosi, and Santiago Mints, 1752-1771, Long Beach, CA: Agorocu Consulting, 2018.
- Harris, Robert P., Pillars & Portraits, San José, CA: Bonanza Press, 1968.
- Krause, Chester L., and Colin R. Bruce II, Standard Catalog of World Coins: Spain, Portugal and the New World, Iola, WI: Krause Publications, 2002.
- Cayón, Adolfo, Clemente Cayón and Juan Cayón, Las Monedas Españolas, del Tremis al Euro: del 411 a Nuestros Dias, 2 volumes, Madrid: Cayón-Jano S.L., 2005.
- Calicó, Xavier, Numismática Española: Catálogo General con Precios de Todas las Monedas Españolas Acuñadas desde Los Reyes Católicos Hasta Juan Carlos I, 1474 a 2001, Barcelona: Aureo & Calicó, 2008.