Related Clues:

• Hard to get
• More than uncommon
• Nearly unobtainable
• Like the spotted owl
• Antiquarian's adjective
• April addressee
• Unwonted
• Not easily found
• Few and far between
• Little-seen
• Extremely uncommon
• Org. with a complex code
• Coin rating
• Spring collector: Abbr.
• Nearly unique in the world