
In coin collecting, brockage refers to a type of error coin in which one side of the coin has the normal design and the other side has a mirror image of the same design impressed upon it. Brockage errors are caused when an already minted coin sticks to the coin die and impresses onto another coin that hasn`t been struck yet, pressing a mirror ima....
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http://en.wikipedia.org/wiki/Brockage

Originally referring to metal wasted in coin production, now means coins struck when the previous coin remains stuck to a die, creating an incuse impression in the next struck coin (primarily found in ancient coins).
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http://en.wikipedia.org/wiki/Glossary_of_numismatics

A mis-struck coin, on which the design appears normally on one side, but with the same design in intaglio or incuse form on the other. It is caused by a previously struck coin failing to eject from the pair of dies.
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http://www.antique-marks.com/antique-terms-b.html

A mirror image of a design from one side of a coin impressed on the opposite side, e.g. a newly struck coin may adhere to the die, causing the next coin struck to have a First Strike Mirror Brockage of the coin stuck to the die; by the second strike the mirror is distorted, and later strikes are termed Struck Through A Capped Die.
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http://www.encyclo.co.uk/local/10142

A mis-struck coin, on which the design appears normally on one side, but with the same design in INTAGLIO or INCUSE form on the other. It is caused by a previously struck coin failing to eject from the pair of DIES.
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http://www.encyclo.co.uk/visitor-contributions.php

Originally metal wasted in coin production, now coins struck when the previous coin remained stuck to a die, creating an incuse impression in the next struck coin (primarily found in ancient coins).
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http://www.translationdirectory.com/glossaries/glossary100.htm

a defect or fault imposed on a coin during its minting.
Found on
https://www.infoplease.com/dictionary/brockage
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