$20 star notes
A star at the end of the serial means the note replaced a sheet spoiled during printing. On a $20, whether that is worth anything depends entirely on the size of the run it came from — and $20 runs range from 128,000 notes to 6,400,000.
Look up the print run for this star note — enter the serial and it identifies the exact run, its size, and whether that makes it scarce.
What the data says about $20 star notes
| Runs indexed | 111 |
|---|---|
| Districts covered | 12 |
| Smallest run | 128,000 notes |
| Typical run | 1,280,000 notes |
| Largest run | 6,400,000 notes |
| Scarce by run size | 14 of 111 |
| Common | 57 of 111 |
57 of the 111 indexed $20 star runs are common, so "it has a star" is not by itself an answer. The scarcest recorded is the Series 2017 Boston, MA run of 320,000 notes.
The rule that decides it
A run of 640,000 notes or fewer is the collector threshold — but only counts if no larger run exists for the same denomination, series and district. When a larger run exists, collectors source from that one instead and the small run's premium never appears. That conditioning is why some small $20 runs rank as only moderately scarce.
The full explanation, the tier definitions and the lookup itself are on the star note lookup.