| Image Thumbs | |
| Cert Num | 1240022 |
| Cert Date | 2011-08-22 |
| Catalog Number | 515 |
| Country | USA |
| Year | 1917 |
| Denom | 20c |
| Color | Light ultramarine |
| Grade | Ungraded |
| Description | Mint OGph |
| Opinion | it is a genuine unused, o.g., previously hinged, top margin Plate No. 6908 block of six (the bottom right stamp previously hinged, other never hinged). |
| Cert Link | http://psestamp.com/Cert/1240022 |