Related Clues:

• Most valuable, possibly
• #1 in exoticness
• Most likely to raise eyebrows
• Most prized, often
• Most red
• As weird as they come
• Most quirky
• Like the most valuable baseball cards, e.g.
• Most scarce
• Least done
• Found least often
• Closest to extinction
• Least commonplace
• Most weird
• Closest to unique