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.
Machine doubling - Doubling of details resulting from loose dies during the striking process (much more common and much less valuable than die doubling).
machine doubling Doubling of details resulting from loose dies during the minting process (generally considered to have no numismatic value) mail bid An auction format in which bids are submitted by mail; ...
Machine doubling is visible on the reverse.
Purchased from Stanley Kesselman, July 9, 1968.
Strike doubling is often referred to by others as "mechanical doubling," "machine doubling damage," "shelf doubling," "die bounce," and a host of other terms.
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.
Double Die - A dubious term sometimes intended to mean a doubled die coin and sometimes indicating machine doubling (Because there is often a substantial difference in value between the two, ...
Double Die - A coin struck by a working die that has two slightly rotated impressions from a working hub. This is not to be confused with machine doubling which creates a shelf like doubling affect on the coin.
defect that causes the metal to peel or flake away LD Large Date LF Large Fraction LG or Lg Large LL Large Letters LND Large Narrow Date LS Large Stars Lt Light or lightly LTS Light Scratch MACHINE DOUBLING ...
 See also: Coin, Strike, Numismatic, Struck, Coinage
  
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