Related Clues:

• Like a 1943 copper penny
• Escort
• Out of the ordinary
• Immediately payable
• Facing extinction
• Answer to a waiter, sometimes
• Nearly extinct
• Still pink
• Owed
• Uncommonly good
• Once-in-a-lifetime
• Was indebted to
• Library stamp word
• Like hens' teeth, so to speak
• Like a 1909-S VDB penny