There are approximately 20 1852/1 Humbert $20s in private hands today. Between three and five examples are mint state. A pair of proof 1852/1 $20s are also known, the first of which traces its provenance back to Augustus Humbert, while the second originally belonged to Assay Office employee and founder of Kellogg & Company, John Glover Kellogg.
| Country | United States of America |
| Year | 1852 |
| Serie | U.S. Assay Office - Moffat-Humbert |
| Denomination | G$20 |
| Mint | California |