| Issuer | Date | Desc | State | ||
| - | no image | Bhutan | 1/29/1972 | empty sheet (#50629) | incomplete |
| - | no image | Bhutan | 2/28/1972 | empty sheet (#50630) | incomplete |
| - | no image | Bhutan | 4/17/1972 | empty sheet (#50631) | incomplete |
| - | no image | Bhutan | 6/6/1972 | empty sheet (#50632) | incomplete |
| - | no image | Bhutan | 9/1/1972 | empty sheet (#50633) | incomplete |
| - | no image | Bhutan | 9/1/1972 | empty sheet (#50634) | incomplete |
| - | no image | Bhutan | 10/5/1972 | empty sheet (#50635) | incomplete |