| Place of Origin | United States |
|---|---|
| Quality | Used |
| Grade | Ungraded |
| Certification | None |
| Cancellation Type | First Day of Issue |
| Denomination | 11c |
| Year | 1973 |
Check the listing for details. US FDC # C86 11c Electronics Progress Artmaster 1973, 9p945. Listed at 1.25 USD. And this would cover up to about 20 covers. #10 envelopes also are being effected but usually less than.