| Image Thumbs | |
| Cert Num | 1376521 |
| Cert Date | 2020-05-18 |
| Catalog Number | 511 |
| Country | USA |
| Year | 1917 |
| Denom | 11c |
| Color | Light green |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, top margin block of nine with Plate No. 12579 and hinge reinforced in the selvage. |
| Cert Link | http://psestamp.com/Cert/1376521 |