| Event | FDC |
|---|---|
| Narrative | Samuel L. Clemens - Mark Twain Postmark #1: Hannibal, MO — 1985-12-04 Stamp: Comet Tail Viewed from Space, 36 cents (Scott #UC60) |
| Cachet Sponsor | GWMSC |
| Design | Pictorial |
| Scott # | UC60 |
| Stock # | G-85-011 |
| Postmark Type | FDC |
| Location | Hannibal, MO |
| Owner | GWMSC |