| Image Thumbs | |
| Cert Num | 1189599 |
| Cert Date | 2009-01-21 |
| Catalog Number | C23c |
| Country | USA |
| Year | 1938 |
| Denom | 6c |
| Color | Ultramarine & carmine |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, top margin Plate No. block of ten, with Plate Nos. 21910 and F 21948, two 'TOP' markings and two registration markers. |
| Cert Link | http://psestamp.com/Cert/1189599 |