coinic: In answer to your question, yes. All machine doubling. At first it can be very difficult to tell the difference between the two, but look at the 'doubled' areas. A trye double die will have the doubled areas as high as the original area. Machine doubling has the doubling as flat and lower then the surrounding area.
Thanks for the answer, I've been reading a lot about die doubling but never realized the doubled area had to be as high as the oriiginal area. Makes determining between the two a lot easier, thanks again.
coinic, Not all Secondary (doubled) Lettering and Images on Doubled Die coins are the same height as the Primary Lettering and Images! When the Mint Workers are producing Working Hub Dies or Working Dies, they may increase the amount of pressure (PSI) for the second pressing of the Images and Lettering into a specific Die to insure that an additional pressing is not needed. If this is done, then there will definitely be a height difference between the two sets of Images and Lettering. The Other, Other Frank
huntsman: you are right of course. My misstatement. On shelf doubling the flat 'doubling' is the tell tale sign. Dounded dies have a rounded appearance.
Frank, It's funny because I have several rolls of Nickels that I am sure are DDR's but most Coin Dealers that have looked at them, say they are not! Most of them say that it is Strike (Machine) Doubling. This is where I have a problem as some of these Coin Dealers are known for their' own Error and Variety coin finds and I wonder if they are telling me no but at the same time, looking for a high grade example so they can submit it as their' find. The doubling (Secondary strike) which is towards the center of the coin, can be seen all the way around the coin...mainly on the outer lettering but is strongest on "UNITED STATES OF AMERICA". The Secondary Strike appears somewhat flat closest to the Primary Strike but is definitely rounded on the edges. I am almost certain that it is Distorted Hub Doubling, that I believe the Secondary Strike occurred during the first pressing of the Die since it is lower in height (when less pressure is used) than the Primary Strike and that the Primary Strike was the second pressing as the Lettering and Images are the higher/predominant Strike which would indicate the use of higher pressure during this pressing. In reality and in this case, the Primary Strike (second pressing of the Die) would in fact be the Doubled one! How can this be Strike (Machine) Doubling when there is doubling all the way around the coin with the Primary Strike towards the rim and the Secondary Strike towards the center. To me, this can't happen with Strike Doubling (doubling towards or away from the rim and all the way around the coin) and can only be explained by Distorted Hub Doubling as one of the Dies did not return to it's original size after the annealing process. I doubt that any pictures taken with my Digital Camera, would be good enough for you to see what I mean! I may have to send you one of the coins and then you can see for yourself. The Other, Other Frank
The Other, Other Frank: Very interesting posting. I would love to see the originals. In the interim, remember that most dealers cannot tell a doubled die from strike doubling! Good luck. (Hi, Bruce!)
