| Image Thumbs | |
| Cert Num | 1280469 |
| Cert Date | 2014-02-28 |
| Catalog Number | 664 |
| Country | USA |
| Year | 1929 |
| Denom | 6c |
| Color | Red orange |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, lower right margin Plate No. 18937 block of four. |
| Cert Link | http://psestamp.com/Cert/1280469 |