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| Cert Num | 1390489 |
| Cert Date | 2021-01-12 |
| Catalog Number | 517 |
| Country | USA |
| Year | 1917 |
| Denom | 50c |
| Color | Red violet |
| Grade | Ungraded |
| Description | Mint OGph |
| Opinion | it is a genuine unused, o.g., previously hinged, top margin Plate No. F13655 block of six (the bottom center stamp PH, others NH). |
| Cert Link | http://psestamp.com/Cert/1390489 |