| 2026-01-23 | Like kyawthuite, among gems |
| 2025-12-08 | Hardest to find |
| 2024-06-05 | Hardest to find, perhaps |
| 2024-03-21 | Closest to raw |
| 2023-09-20 | Like AB negative, among all blood types |
| 2017-06-09 | Like AB negative among blood types |
| 2012-09-09 | Of greatest interest to a bibliophile, maybe |
| 2010-09-13 | Most uncommon |
| 2009-11-21 | Least done |
| 2008-12-18 | Most prized, often |
| 2008-10-17 | Most valuable, possibly |
| 2008-10-12 | Hardest to get |
| 2008-02-02 | Least spotted |
| 2007-09-28 | Least spotted |
| 2007-06-16 | Least known |
| 2007-05-03 | Superlatively collectible |
| 2005-09-07 | Hardest to find |
| 2004-01-26 | Least seen |
| 2001-06-04 | Least cooked |
| 1999-09-05 | Like AB negative, of all major blood types |
| 1997-10-19 | Most collectible |
| 1997-05-27 | Least cooked |
| 1997-01-30 | Describing a numismatist's treasure |
| 1995-06-12 | Most unusual |
| 1994-03-30 | Least prevalent |
| 1994-02-21 | Least done |