| Image Thumbs | |
| Cert Num | 1223844 |
| Cert Date | 2010-06-03 |
| Catalog Number | C1 |
| Country | USA |
| Year | 1918 |
| Denom | 6c |
| Color | Orange |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, center line block of four with a natural gum crease in the right pair. |
| Cert Link | http://psestamp.com/Cert/1223844 |