| Obverse description | Arms of the country with name above. |
| Obverse script | Latin |
| Obverse lettering | ESTADOS
UNIDOS MEXICANOS (Translation: United Mexican States) |
| Reverse description | Stylized Mayan drawing, legend on the left with value and date. |
| Reverse script | Latin |
| Reverse lettering | CULTURA MAYA
20 PESOS
1979
Mo (Translation: Mayan culture) |
| Edge | |
| Mint | Mexican Mint (Casa de Moneda de México), Mexico, Mexico (1535-date) |
| Mintage | 1979 Mo - - |
| Catalog ID | 1589439030 |
| Comments |