| Issuer | Date | Desc | State | ||
| - | no image | Bhutan | 6/2/1974 | empty sheet (#50645) | incomplete |
| - | no image | Bhutan | 6/2/1974 | empty sheet (#50646) | incomplete |
| - | no image | Bhutan | 10/30/1974 | empty sheet (#50647) | incomplete |
| - | no image | Bhutan | 12/17/1974 | empty sheet (#50648) | incomplete |