Related Clues:

• Describing a numismatist's treasure
• Least cooked
• Most collectible
• Least common
• Least sensible
• Like AB negative, of all major blood types
• Most unusual
• Most halting
• Least satisfactory
• Most infrequent
• Least available
• Least seen
• Superlatively scarce
• Most unconvincing
• Most elusive