| Issuer | Date | Desc | State | ||
| - | no image | El Salvador | 7/1/1961 | empty sheet (#22725) | incomplete |
| - | no image | El Salvador | 7/1/1961 | empty sheet (#22726) | incomplete |
| - | no image | El Salvador | 8/1/1961 | empty sheet (#22727) | incomplete |
| - | no image | El Salvador | 8/1/1961 | empty sheet (#22728) | incomplete |