Variety, Error, Die State or Damage?
Begin with the essential distinctions. Learn how to evaluate an unusual coin and separate repeatable varieties, progressive die changes, minting errors and post-mint damage.
Read Essay 1 →Exploring Canadian Coinage
An Illustrated Educational SeriesWhat makes one unusual Canadian coin a recognized variety, another a mint error, and a third simply a damaged coin? The answer begins with understanding how coins are made and what happens to the dies, planchets and finished coins along the way.
This illustrated CoinData series approaches those questions step by step. Each essay builds on the last, combining explanations, diagnostic principles and visual examples to help collectors recognize the physical evidence behind an attribution. You can follow the chapters in sequence or explore a subject individually.
Explore the Essays
How a Coin Is Made — and Where Things Go Wrong
Follow the journey from metal strip and blank to finished coin. See where planchet flaws, die problems and striking errors can originate during production.
Read Essay 2 →Die Varieties: When the Difference Is in the Tool
Explore doubled dies, repunched dates and mint marks, re-engraving and other repeatable differences that can identify a particular working die.
Read Essay 3 →Die States, Deterioration and Mortar Set
Examine how working dies change through use, how deterioration affects struck coins and why progressive die states should not be confused with distinct varieties.
Read Essay 4 →Die Cracks, Chips, Breaks and Cuds
Discover how fractures and breaks in working dies create raised features on Canadian coins. Learn to recognize die cracks, chips, retained breaks and rim-connected cuds, and distinguish these mint-made characteristics from damage.
Read Essay 5 →More Essays Coming SoonAdditional illustrated chapters on planchet defects, striking errors, post-mint damage and practical coin identification are planned.