| Image Thumbs | |
| Cert Num | 1406535 |
| Cert Date | 2022-02-16 |
| Catalog Number | 1931 |
| Country | USA |
| Year | 1981 |
| Denom | 18c |
| Color | Black & red |
| Grade | XF 90 |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, lower right margin Zip block of four. |
| Cert Link | http://psestamp.com/Cert/1406535 |