See Rotated Dies.
DIE STATE
A state or stage of a die's life distinguished from other states by new cracks or by polishing or something else happening to it but now preventing its further use.
Upset
A mint error which occurs when a coin has been struck with rotated dies. The difference in angle between an upset coin and a "normal" one is measured in degrees. An angle of less than 15 degrees is not considered to be a major mint error.
Some striking weakness is present, not an unusual occurrence for the date. Struck from rotated dies, with the reverse lined up at about 120°, as opposed to the usual 180° die alignment. Choice for the grade, and quite rare at the AU level.
 See also: Mint state, Mint, Planchet, Rarity, Rim
  
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