| Issuer | Date | Desc | State | ||
| X | no image | Ecuador | 4/11/1957 | empty sheet (#20678) | incomplete |
| - | no image | Ecuador | 4/11/1957 | empty sheet (#20679) | incomplete |
| X | no image | Ecuador | 4/11/1957 | empty sheet (#20680) | incomplete |
| X | no image | Ecuador | 8/28/1957 | empty sheet (#20681) | incomplete |
| X | no image | Ecuador | 8/28/1957 | empty sheet (#20682) | incomplete |