| Image Thumbs | |
| Cert Num | 1223871 |
| Cert Date | 2010-06-07 |
| Catalog Number | 511 |
| Country | USA |
| Year | 1917 |
| Denom | 11c |
| Color | Light green |
| Grade | Ungraded |
| Description | Mint OGh |
| Opinion | it is a genuine unused, o.g., hinged, block of four, (the top left and bottom stamps never hinged). |
| Cert Link | http://psestamp.com/Cert/1223871 |