| Issuer | Date | Desc | State | ||
| - | no image | Bhutan | 3/28/1967 | empty sheet (#50593) | incomplete |
| - | no image | Bhutan | 5/25/1967 | empty sheet (#50594) | incomplete |
| - | no image | Bhutan | 6/26/1967 | empty sheet (#50595) | incomplete |
| - | no image | Bhutan | 8/8/1967 | empty sheet (#50596) | incomplete |
| - | no image | Bhutan | 9/28/1967 | empty sheet (#50597) | incomplete |
| - | no image | Bhutan | 10/30/1967 | empty sheet (#50598) | incomplete |
| - | no image | Bhutan | 10/30/1967 | empty sheet (#50599) | incomplete |
| - | no image | Bhutan | 10/30/1967 | empty sheet (#50600) | incomplete |