| Issuer | Date | Desc | State | ||
| - | no image | Bhutan | 2/15/1976 | empty sheet (#50652) | incomplete |
| - | no image | Bhutan | 3/29/1976 | empty sheet (#50653) | incomplete |
| - | no image | Bhutan | 4/23/1976 | empty sheet (#50654) | incomplete |
| - | no image | Bhutan | 4/23/1976 | empty sheet (#50655) | incomplete |
| - | no image | Bhutan | 5/29/1976 | empty sheet (#50656) | incomplete |