Hoe money Oaxaca Region; Type 2a

These examples (Holser et al. Type 2a) are attributed to the region of Oaxaca, based on individual and hoard find spots. These appear more hoe-like than those without hammered edges, being more refined and smaller. Types 2a and 2b likely intentionally resemble mushrooms, due to the spiritual and ceremonial significance mushrooms had to the people of Oaxaca during the Mesoamerican Postclassical period, before the European invasion. 
 

Hosler, Dorothy, Heather Lechtman, and Olaf Holm. Axe-Monies and Their Relatives. Studies in Pre-Columbian Art & Archaeology, Number Thirty. Washington, D.C.: Dumbarton Oaks Research Library and Collection, 1990

These general types are known as Hoe money or Aztec hoes; however, that last term is a misnormer as the Aztecs did not actually use this as a currency. For a more comprehensive essay on these Hoe money pieces, please read The Hoe Money of Central and South America by James Martin.