| Image Thumbs | |
| Cert Num | 1197648 |
| Cert Date | 2009-03-10 |
| Catalog Number | C9 |
| Country | USA |
| Year | 1927 |
| Denom | 20c |
| Color | Yellow green |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, left margin Plate No. 18893 block of six. |
| Cert Link | http://psestamp.com/Cert/1197648 |