Related Clues:
- Most desirable to collectors, as a rule
- Not even Parisian is as curious as can be
- Most hard-to-find
- Like astatine, among all naturally occurring elements
- AB negative, among blood types
- Least common in Connemara restoration
- Like AB negative, among blood types
- Most collectible, perhaps
- Farthest out there
- Sartre (anag) — most uncommon
- Most unusual artist on break
- Least frequent
- Most endangered
- Sartre turned out to be most unusual
- Maximally atypical