| Issuer | Date | Desc | State | ||
| - | no image | Mexico | 6/15/1979 | Universiada 79, empty sheet (#50522) | incomplete |
| - | no image | Mexico | 6/15/1979 | Universiada 79, empty sheet (#50523) | incomplete |
| - | no image | Mexico | 9/2/1979 | empty sheet (#50524) | incomplete |
| - | no image | Mexico | 9/2/1979 | empty sheet (#50525) | incomplete |
| - | no image | Mexico | 10/26/1979 | 400th Anniversary of Royal Proclamation of Mail Services in the New World, empty sheet (#50526) | incomplete |