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| Cert Num | 1269933 |
| Cert Date | 2013-08-30 |
| Catalog Number | O18 |
| Country | USA |
| Year | 1873 |
| Denom | 6c |
| Color | Vermilion |
| Grade | Ungraded |
| Description | Mint OGh |
| Opinion | it is a genuine unused, o.g., hinged, bottom margin block of four with Plate No. 56 (the bottom stamps never hinged) with horizontal perf separations. |
| Cert Link | http://psestamp.com/Cert/1269933 |