OBOL
| Date | Clue |
|---|---|
| 2016-06-16 | Ancient Greek coin |
| 2015-05-31 | Coin to pay for passage across the River Styx |
| 2012-09-30 | One-sixth of a drachma |
| 2012-06-19 | Ancient Greek coin |
| 2010-03-09 | Silver coin of ancient Greece |
| 2000-03-03 | Ancient Greek coin |
| 1997-04-25 | Ancient Greek coin |
| 1995-03-19 | One-sixth of a drachma |