Bon matin Jumpy
Pour le nom j'irais avec "Empreinte de frappe"
Voici deux liens parmi d'autres, qui l'expliquent.
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http://www.coinworld.com/newcollector/e ... riking.asp
Indented errors: An indented error is a coin struck with another coin or planchet lying partially on its surface. The area covered by the planchet does not come into contact with the die, and thus is blank if indented by a planchet, or shows a partial brockage if indented by a struck coin. The most desirable of the indented errors are larger coins with the indentation of a smaller planchet centered on one side.
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http://home.psknet.com/tbirde1/Varieties/Varieties.html
Indented error - When two planchets are in the coining chamber at the same time. The two planchets may overlap each other, be of different sizes, or they maybe a blank and a coin together. See types below.
----- Types of indents -----
1. Indented strike - Occurs when two planchets are fed inadvertently into the coining chamber, with one planchet partly overlapping (on top of) the other. When the hammer die strikes this combination, the upper planchet will be forced into the lower planchet, creating a depression which is shaped similar to the upper planchet, and shows no design details in the indented area
2. Indented strike of smaller planchet - A scarce type of indent occurs when a planchet intended for one denomination lands on top of a planchet from a different denomination in the coining chamber
3. Indented second strike - Results from a planchet and a struck coin coming together in the coining chamber, the design of the first strike (coin) will be flattened and stretched out, in the indented area. The second planchet showing signs of a brockage
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