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It should be noted – “There are theories, but no definitive answers” concerning Longacre doubling. If attributable to only the master die as suggested in both theories - does not explain why the doubling manifest itself in such a diverse manner on coins from the same series in the same year. I am inclined to believe that the procedures which produced Longacre doubling in the master were also utilized in the production process of the working die. Meaning Longacre doubling can be attributable to both the master and working die.
The difference can still not be seen to me, and it is really bothering me.
I don't understand a lot of things about errors in general.
So I know that machine doubling is the die, slightly shifted while the planchet is being struck.
The doubled die, is when the die is being pressed with the design, and the die itself shifts, so parts of the lettering, or other parts of the design get doubled on the die, and that transfers over to the planchet
So now, I am just trying to tackle the difference between the Longacre Doubling and Doubled Die
If you go back to the machine doubling vs doubled die thread there are some good pics of true doubled die coins to look at the difference.
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"Life is to short for bad wine" Viper
As you can see from this picture, the 'doubling' to the letters is a clear outline to the letters.
Also, note that the outline is flat (as often stated: shelf like). This is important. The outline to the letters is much lower than the 'original' lettering. The net result is not a duplicate, as shown on the 1955 DDO above.
The 1955 DDO (doubled die obverse) clearly shows that both sets of numbers are the same height. This is a true classic example of a doubled die.
Nice informative piece frank thx for sharing... btw nice close-ups of the doubling... can i request you to post a pic of the entire coin
sorry for the late repy, just got back from 48hr shift :|
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Hard subject made easier thanks!!! 
thx for sharing... btw nice close-ups of the doubling... can i request you to post a pic of the entire coin 
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