| Denomination | Forever Stamp |
|---|---|
| Year of Issue | 2011 |
| Place of Origin | United States |
| Quality | Mint Never Hinged/MNH |
| Grade | Ungraded |
| Certification | Uncertified |
Check the listing for details. 2011 US Sc. #U667b Forever window stamped envelope, size 9 security, mint, nice. Listed at 1.00 USD. The window envelope is in very good condition. It has an unsealed flap. It is a size 9 security envelope with the 2011 date. Note that the vertical dark shading on the left side of the envelope is not on the envelope itself but is the result of the photographic process.