Clue: Mailing-date indicators

Answer: POSTMARKS

Length: 9

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Similar Clues:

• Proposal date, perhaps (STVALENTINESDAY with 15 letters)
• Early seventh century date (DCI with 3 letters)
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• Date in reign of Henry I (MCI with 3 letters)
• Mailing cost (POSTAGE with 7 letters)
• Expense incurred in mailing a handbook? (GUIDEPOSTAGE with 12 letters)
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• Result of being on the wrong mailing list, perhaps (SPAM with 4 letters)