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Doubled die is a term in numismatics used to refer to doubling in the design elements of a coin. Doubled dies can appear as an outline of the design or in extreme cases, having legends and dates appear twice in an overlapping fashion. Doubled die error coins can fetch significant prices when they are noticeable to the naked eye or occur in a popular coin series. One example of this is the 1955 doubled die Lincoln Wheat cent. Note that the proper terminology for this occurrence includes the letter 'd' at the end of the first word, hence "doubled die". The term "double die" without the first word ending in 'd' is not proper numismatic terminology. ==Classes of Doubled Dies== Doubled dies are created when the hub imprints an additional, misaligned image onto a die. There are many ways this misalignment of images can occur, which have been classified into eight accepted classes: ;Class 1, Rotated :A class I doubled die results when the die receives an additional hubbing that is misaligned in a clockwise or counterclockwise direction. ;Class 2, Distorted :A class 2 doubled die results when the hub's design moves toward the rim between hubbings. ;Class 3, Design :A class 3 doubled die results when a hub bearing a different design stamps a die bearing another design. ;Class 4, Offset :A class 4 doubled die results when the die receives an additional hubbing that is misaligned in an offset direction. ;Class 5, Pivoted :A class 5 doubled die results when the die receives an additional hubbing that was misaligned via rotation with a pivot point near the rim. ;Class 6, Distended :A class 6 doubled die results when the die receives an additional hubbing from a hub that was distended. ;Class 7, Modified :A class 7 doubled die results when the hub is modified between the die's hubbings (e.g., a design element was chiseled off). ;Class 8, Tilted :A class 8 doubled die results when a die and/or hub is tilted during a hubbing. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Doubled die」の詳細全文を読む スポンサード リンク
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