Possible Clues:

• Mason's unforgettable work
• Statue, perhaps
• Monument such as the Cenotaph
• Note Middle Eastern money was found at monument
• Pollsters grub about for a souvenir
• Commemorative structure
• Note foreign money may be brass
• Monument, e.g.
• So as not to forget me, I come in a well-behaved way
• A reminder for those who are late