| Event | FDC |
|---|---|
| Narrative | Ft. McHenry Flag Postmark #1: Baltimore, MD — 1978-06-30 Stamp: Fort McHenry Flag - 15 Stars, 15 cents (Scott #1597) |
| Cachet Sponsor | GWMSC |
| Design | Pictorial |
| Scott # | 1597 |
| Stock # | G-78-004 |
| Postmark Type | FDC |
| Location | Baltimore, MD |
| Owner | GWMSC |