| Issuer | Date | Desc | State | ||
| - | no image | Paraguay | 1/27/1968 | empty sheet (#36564) | incomplete |
| - | no image | Paraguay | 1/27/1968 | empty sheet (#36565) | incomplete |
| - | no image | Paraguay | 4/23/1968 | empty sheet (#36566) | incomplete |
| - | no image | Paraguay | 6/3/1968 | empty sheet (#36567) | incomplete |
| - | no image | Paraguay | 7/9/1968 | empty sheet (#36568) | incomplete |
| - | no image | Paraguay | 9/25/1968 | empty sheet (#36569) | incomplete |
| - | no image | Paraguay | 12/21/1968 | empty sheet (#36570) | incomplete |
| - | no image | Paraguay | 12/21/1968 | empty sheet (#36571) | incomplete |
| - | no image | Paraguay | 12/21/1968 | empty sheet (#36572) | incomplete |