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・ Brock Vereen
・ Brock Virtue
・ Brock Williams
・ Brock Williams (screenwriter)
・ Brock Winkless
・ Brock Yates
・ Brock Zeman
・ Brock's Green
・ Brock's Monument
・ Brock's yellow-eared bat
・ Brock, Nebraska
・ Brock, Oklahoma
・ Brock, Ontario
・ Brock, Saskatchewan
・ Brock, Texas
Brockage
・ Brockagh
・ Brockbank
・ Brockbank Jr. High
・ Brockbridge
・ Brockbridge Correctional Facility
・ Brockdish
・ Brockdorff
・ Brockdorff's Palace
・ Brockel
・ Brocken
・ Brocken (disambiguation)
・ Brocken (South Georgia)
・ Brocken Garden
・ Brocken Pond


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Brockage : ウィキペディア英語版
Brockage

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.
==Description==
Brockage errors are caused when an already minted coin sticks to the coin die and impresses onto another blank that hasn't been struck yet, pressing a mirror image of the other coin into the blank. Brockages are relatively rare among modern coins of industrialised countries where mints exercise a strict production control and somewhat less rare among the modern coins of some developing countries which operate their own mint (e.g. Nepal); in good condition, coins with clear brockage are a collector's item and can sell for substantial amounts of money.
One can distinguish between obverse and reverse brockages. Obverse brockages occur when the previously struck coin was not ejected and gets stuck to the lower die, and reverse brockages when the previously struck coin remains stuck to the upper die.
〔(【引用サイトリンク】work=Forvm Ancient Coins:Articles )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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