| Issuer | Date | Desc | State | ||
| - | no image | Paraguay | 2/28/1977 | empty sheet (#36747) | incomplete |
| - | no image | Paraguay | 2/28/1977 | empty sheet (#36748) | incomplete |
| - | no image | Paraguay | 3/3/1977 | empty sheet (#36749) | incomplete |
| - | no image | Paraguay | 3/3/1977 | empty sheet (#36750) | incomplete |
| - | no image | Paraguay | 6/7/1977 | empty sheet (#36751) | incomplete |
| - | no image | Paraguay | 6/7/1977 | 80th Anniversary of the Death of Alfred Nobel / 75th Anniversary of Nobel Prize Award, sheet of 1 type | incomplete |
| - | no image | Paraguay | 6/9/1977 | LUPOSTA '77, empty sheet (#36753) | incomplete |
| - | no image | Paraguay | 6/9/1977 | empty sheet (#36754) | incomplete |
| - | no image | Paraguay | 7/18/1977 | empty sheet (#36755) | incomplete |
| - | no image | Paraguay | 7/18/1977 | empty sheet (#36756) | incomplete |
| - | no image | Paraguay | 7/25/1977 | empty sheet (#36757) | incomplete |
| - | no image | Paraguay | 7/25/1977 | empty sheet (#36758) | incomplete |
| - | no image | Paraguay | 8/27/1977 | empty sheet (#36759) | incomplete |
| - | no image | Paraguay | 8/27/1977 | empty sheet (#36760) | incomplete |
| - | no image | Paraguay | 9/5/1977 | empty sheet (#36761) | incomplete |
| - | no image | Paraguay | 9/5/1977 | empty sheet (#36762) | incomplete |
| - | no image | Paraguay | 10/28/1977 | empty sheet (#36763) | incomplete |
| - | no image | Paraguay | 10/28/1977 | empty sheet (#36764) | incomplete |
| - | no image | Paraguay | 10/28/1977 | empty sheet (#36765) | incomplete |
| - | no image | Paraguay | 10/28/1977 | empty sheet (#36766) | incomplete |