CrosswordMint
Philatelic Enigmas of Historical Epochs
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Small strip stamp popular in French 19th-century issues
  • 2. Historic agreement influencing postal conventions worldwide
  • 4. Issued to honor significant events or anniversaries
  • 10. Removal of postal fees, often shown on revenue stamps
  • 12. Famous postal anomaly: upside-down print error
  • 14. Rare lithographed stamp with a geological-inspired name
  • 15. Date and place imprint revealing mailing origin
Down
  • 3. Decorative embossed edging sometimes found on old issues
  • 5. Special ink feature for identification under UV light
  • 6. Series of holes enabling separation, critical for authentication
  • 7. Postal mark to invalidate a stamp’s repeated use
  • 8. Subtle embedded design revealing issue and forging history
  • 9. An expert dedicated to collecting and studying stamps
  • 11. Additional text or design printed atop a stamp’s face
  • 13. Illicitly produced stamp intended to deceive collectors
  • 16. Distributed sample stamps to postal administrations as a reference
  • 17. Prepaid fee indicated on a stamp
  • 18. Method shaping stamps beyond simple perforation

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