| Clue | Source | Date |
|---|---|---|
| Savings bond group | Universal | 17 May 2020 |
| Inflation-indexed U.S. savings bond | LA Times Daily | 12 Jul 2019 |
| Inflation-indexed U.S. savings bond | The Washington Post | 12 Jul 2019 |
| Inflation-indexed U.S. savings bond | ||
| First group in a product run |