| ID | 1851 |
| Thumbnail | |
| Cat Number | 1858 |
| Variety | v1 |
| Description | George Mason, Statesman |
| Series | Great Americans |
| Denomination | 18ยข |
| Color | Dark Blue |
| Separation Method | PF |
| Extent Perf Die Cut | 4 |
| HPerf | 11.00 |
| VPerf | 10.50 |
| Tagging | Overall |
| Tagging Color | |
| Paper Type | LF |
| Adhesive | WA |
| Gum Type | D |
| Format | S |
| EFO | |
| Watermark | unw. |
| Specialfeatures | paper low fluorescence under LW |
| Printing Type | engraved |
| Stamp Date | ---- |
| Printer Engraver | |
| Issue Year | 1981 |
| Image1 | |
| Issue Date | 5/7/1981 |
| Quantity Issued | |
| Visible | Yes |