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| Cert Num | 1378207 |
| Cert Date | 2020-06-29 |
| Catalog Number | C81 |
| Country | USA |
| Year | 1973 |
| Denom | 21c |
| Color | Red, blue & black |
| Grade | Ungraded |
| Description | Mint OGnh |
| Opinion | it is a genuine unused, o.g., never hinged, left margin MAIL EARLY block of six (2x3). |
| Cert Link | http://psestamp.com/Cert/1378207 |