| Image Thumbs | |
| Cert Num | 1355902 |
| Cert Date | 2018-12-25 |
| Catalog Number | 511a |
| Country | USA |
| Year | 1917 |
| Denom | 11c |
| Color | Light green |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, block of four, the bottom right stamp with transitional gauge perf 10/11, the others Scott No. 511. |
| Cert Link | http://psestamp.com/Cert/1355902 |