| Issuer | Date | Desc | State | ||
| - | no image | Bhutan | 1/1/1993 | empty sheet (#50923) | incomplete |
| - | no image | Bhutan | 2/22/1993 | empty sheet (#50924) | incomplete |
| - | no image | Bhutan | 5/2/1993 | empty sheet (#50925) | incomplete |
| - | no image | Bhutan | 7/1/1993 | empty sheet (#50926) | incomplete |
| - | no image | Bhutan | 8/14/1993 | empty sheet (#50927) | incomplete |