Lesson plan
mint-made errors
struck off-center Mint-made errors occur when coins are made incorrectly at the mint, including anything that happens to the coin up until the completion of the minting process. Mint error coins can be the result of deterioration of the minting equipment, accidents or malfunctions during the minting process, or interventions by mint personnel. Coins are inspected during production and errors are typically caught. However, some are inadvertently released into circulation. Modern production methods eliminate many errors, and automated counters are effective at removing error coins. Damage occurring later (post-mint damage (PMD)) may sometimes resemble true mint errors. Error coins may be of value to collectors, depending on the rarity and condition. Some coin collectors specialize in error coins. Errors can be the result of defective planchets , defective dies or the result of mistakes made during striking . The planchet, die, and striking (or PDS) classification system happens to correspond with the mintmarks of the three largest U.S. mints, Philadelphia, Denver, and San Francisco. Some errors have multiple causes, and not all errors fall neatly within the categories. For example, design elements may be missing from coins because die crevices were filled with grease a problem with the die, but the error occurs when the coin is struck.…
Article summary
struck off-center Mint-made errors occur when coins are made incorrectly at the mint, including anything that happens to the coin up until the completion of the minting process. Mint error coins can be the result of deterioration of the minting equipment, accidents or malfunctions during the minting process, or interventions by mint personnel. Coins are inspected during production and errors are typically caught. However, some are inadvertently released into circulation. Modern production methods eliminate many errors, and automated counters are effective at removing error coins. Damage occurring later (post-mint damage (PMD)) may sometimes resemble true mint errors. Error coins may be of value to collectors, depending on the rarity and condition. Some coin collectors specialize in error coins. Errors can be the result of defective planchets , defective dies or the result of mistakes made during striking . The planchet, die, and striking (or PDS) classification system happens to correspond with the mintmarks of the three largest U.S. mints, Philadelphia, Denver, and San Francisco. Some errors have multiple causes, and not all errors fall neatly within the categories. For example, design elements may be missing from coins because die crevices were filled with grease a problem with the die, but the error occurs when the coin is struck.…
Key claims
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.