| Event | SE |
|---|---|
| Narrative | GWMSC 25th Anniversary Postmark #1: Washington, DC — 1981-10-24 Stamp: Flag, Purple Mountians, 18 cents (Scott #1893) |
| Cachet Sponsor | GWMSC |
| Design | Pictorial |
| Scott # | 1893 |
| Stock # | G-81-006 |
| Postmark Type | Std |
| Location | Washington, DC |
| Owner | GWMSC |