Error Coins
Browse error types alphabetically, then open the guide page for identification notes, false positives, authenticity cautions, photos, videos, and value guidance as each entry is expanded.
Browse by Family
Start With The Type Of Error
Use broad error families when you know the kind of problem you are investigating, then open the individual guide pages for diagnostics and cautions.
Altered Coins and Lookalikes
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Attribution and Collecting Topics
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Brockage Errors
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Clad, Plating, and Composition Errors
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Collar, Rim, and Edge Errors
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Die Breaks, Chips, and Cracks
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Die Cap and Cap-Related Errors
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Die Events, Varieties, and Diagnostics
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Multiple-Strike and Bonded Errors
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Planchet Errors
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Striking Errors
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Struck-Through and Filled-Die Errors
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Transitional and Wrong-Planchet Issues
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Collector Starting Points
Not Sure What You Have?
These common paths are meant to help newer collectors narrow the question before jumping into the full A-Z list.
Planchet Problems
Blank planchets, clipped planchets, missing layers, and metal or thickness issues.
Striking Errors
Off-center strikes, broadstrikes, multiple strikes, indents, and collar-related errors.
Diagnostics And Lookalikes
Separate genuine mint errors from damage, alteration, machine doubling, and common false positives.
Breaks, Chips, And Cracks
Cuds, retained breaks, chips, cracks, and related raised-metal features.
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