| ID | 2784 |
| Thumbnail | |
| Cat Number | 2180 |
| Variety | f2 |
| Description | Chester Carlson, Inventor |
| Series | Great Americans |
| Denomination | 21ยข |
| Color | Blue-Violet |
| Separation Method | PF |
| Extent Perf Die Cut | 4 |
| HPerf | 11.00 |
| VPerf | 11.00 |
| Tagging | Large Block |
| Tagging Color | |
| Paper Type | NF |
| Adhesive | WA |
| Gum Type | D |
| Format | S |
| EFO | F |
| Watermark | unw. |
| Specialfeatures | paper light brown under LW; tagging smearing entire top |
| Printing Type | engraved |
| Stamp Date | ---- |
| Printer Engraver | |
| Issue Year | 1988 |
| Image1 | |
| Issue Date | 10/21/1988 |
| Quantity Issued | |
| Visible | Yes |