| Issuer | Date | Desc | State | ||
| - | no image | Bhutan | 1/19/1970 | empty sheet (#50616) | incomplete |
| - | no image | Bhutan | 1/19/1970 | empty sheet (#50617) | incomplete |
| - | no image | Bhutan | 5/6/1970 | empty sheet (#50618) | incomplete |
| - | no image | Bhutan | 5/6/1970 | empty sheet (#50619) | incomplete |
| - | no image | Bhutan | 5/6/1970 | empty sheet (#50620) | incomplete |
| - | no image | Bhutan | 5/6/1970 | empty sheet (#50621) | incomplete |
| - | no image | Bhutan | 11/9/1970 | empty sheet (#50622) | incomplete |
| - | no image | Bhutan | 11/9/1970 | empty sheet (#50623) | incomplete |
| - | no image | Bhutan | 11/30/1970 | empty sheet (#50624) | incomplete |