| 1968 | 1968 | 1968 | 1968 |
 |
 |
|
 |
| Mayan Calendar | Mayan Calendar | Mayan Calendar | Mayan Calendar |
| SG | SG | SG | SG |
| Scott 210 | Scott 211 | Scott 212 | Scott 213 |
| Stylised Owls | Stylised Owls | Stylised Owls | Stylised Owls |
| 1968 | 1968 |
 |
 |
| Mayan Calendar | Mayan Calendar |
| SG | SG |
| Scott 214 | Scott 215 |
| Stylised Owls | Stylised Owls |