Definition: Mechanical doubling, also called machine doubling or strike doubling, a form of doubling which appears on a coin and is easily confused with doubled die strikes.
strike doubling
Another term for machine doubling.
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tetradrachm
An ancient Greek silver coin weighing about 13 to 17 grams, similar in size to a U.S. quarter but much thicker.
Strike Doubling - See machine doubling.
Symbolic face value: nominal value given to legal tender coins sold for their metal content.
This is Strike Doubling - not a Doubled Die coin (1969-S). [ Coin from Albert Sims ]
(Also known as Machine Damaged Doubling.) ...
Strike doubling was present on several of the specimens examined on the word AMERICA
This is NOT a doubled die and should not be confused as such! ...
Minor strike doubling is visible on the reverse.
From Superior's sale of the Gilhousen Collection, February 1973, Lot 918.
Important Choice Mint State 1879 $20 ...
Do not confuse "Longacre Doubling" with "Machine Doubling Damage" (MDD) or "Strike Doubling". MDD is flat and self like and there is metal flow between the two images. MDD is caused because the die is loose in the coinage press.
planchet production strike - The process of impressing the design from a die into a planchet to make a coin, token or medal
- The degree to which details are transfered during this process (as in weak strike, full strike, etc.) strike ...
 See also: Coin, Strike, Double, Doubled die, Collector
  
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