| ID | 10129 |
| Thumbnail | |
| Cat Number | 1915 |
| Variety | f1 |
| Description | Understanding the Sun |
| Series | Space Achievements |
| Denomination | 18ยข |
| Color | Multicolored |
| Separation Method | PF |
| Extent Perf Die Cut | 4 |
| HPerf | 11.00 |
| VPerf | 11.00 |
| Tagging | Block |
| Tagging Color | |
| Paper Type | |
| Adhesive | WA |
| Gum Type | S |
| Format | S |
| EFO | F |
| Watermark | unw. |
| Specialfeatures | block tag shifted somewhat left |
| Printing Type | Photogravure |
| Stamp Date | ---- |
| Printer Engraver | |
| Issue Year | 1981 |
| Image1 | |
| Issue Date | 5/21/1981 |
| Quantity Issued | |
| Visible | Yes |