| Image Thumbs | |
| Cert Num | 1371208 |
| Cert Date | 2019-12-10 |
| Catalog Number | C23a |
| Country | USA |
| Year | 1938 |
| Denom | 6c |
| Color | Dark blue & carmine |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged centerline block of four, imperf horizontally, with two natural gum wrinkles. |
| Cert Link | http://psestamp.com/Cert/1371208 |