| Image Thumbs | |
| Cert Num | 1377152 |
| Cert Date | 2020-09-21 |
| Catalog Number | K8 |
| Country | USA |
| Year | 1919 |
| Denom | 16c on 8c |
| Color | Olive bister |
| Grade | Ungraded |
| Description | Used |
| Opinion | it is a genuine used block of four tied on cover to Portugal by a U.S. Postal Agency, Shanghai, China duplex cancel dated Dec 31, 1922. |
| Cert Link | http://psestamp.com/Cert/1377152 |