| Image Thumbs | |
| Cert Num | 1328760 |
| Cert Date | 2017-03-14 |
| Catalog Number | 1931a |
| Country | USA |
| Year | 1981 |
| Denom | 18c |
| Color | Black & red |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, block of four, the top stamps with the red ink contaminated with black ink. |
| Cert Link | http://psestamp.com/Cert/1328760 |