Jorgeke,
IMO the cost to get these 1/4R coins certified would exceed their value.
These coins were produced locally by the state of Chihuahua to alleviate shortages of small change, acting as a form of "necessity money." The coins, showing a standing Indian holding a bow and arrow, were produced in 1846 and 1854-56.
The coins dated 1846 were illegally struck in Pensylvania, but (obviously) circulated in Mexico.
Coins issued in 1855 having the legend to include the word 'DEPARTMENTO' have a high value than those with the word 'ESTADO".
Don in SoCal