Related Clues:

• Harder to locate
• Not so well done
• More pink, often
• Less brown
• Less encountered
• Done less?
• Harder to spot
• Not as likely to pop up
• More enticing to a philatelist, say
• More valuable, as coins
• More valued, in a way
• More valuable to collectors
• More commonplace
• More valuable, perhaps
• Not as numerous