A unique coin which exists at the National Coin Gallery in the Smithsonian Institution. As such there is no market value. If a second example would ever be discovered, it would surely be the most valuable of all United States coinage.
| Country | United States of America |
| Year | 1849 |
| Serie | American Liberty Gold |
| Denomination | $20 (Twenty Dollars) |
| Mint | Philadelphia |
| coinage-type | Liberty head gold double eagle |
| desg | MS |
| designer | Christian Gobrecht |
| diameter | 34 |
| edge | Reeded |
| fineness | 0.9 |
| material | 90% gold; 10% copper |
| mintage | Unique |
| obverse-description | Christian Gobrecht's portrait of Liberty is surrounded by 13 stars with the date centered at the bottom. |
| pcgs-link | 8901 |
| pcgs-number | 8901 |
| prefix | Unique |
| reverse-description | Shielded eagle with wings outstretched holding arrows and olive branches. The words UNITED STATES OF AMERICA * TWENTY D. appear around the periphery. Mint mark, if any, appears below the eagle's tail, above the N in TWENTY. |
| weight-grams | 33.436 |
| weight-ounces | 0.9675 |
| year-display | 1849-1907 |