| Place of Origin | United States |
|---|---|
| Certification | Uncertified |
| Grade | Ungraded |
| Quality | Stamps, First Days and Postal Stationery |
Check the listing for details. United States Scott 1529 Unaddressed.. Listed at 6.50 USD. 10c Skylab 1974 Houston, TX 77013 First Day of Issue. Philgraf cachet.