So is this what yall mean when u say MD is flat in appearance? And question. If MD is caused by a bounce during minting, does that necessarily mean that not all of the coins design will be affected? Or could it be a case of either or? I've seen the pictures of MD examples and i have read the definitions and understand how differently the creation of DDs are from MD. Now I am trying to train my eyes to spot MD for what it is. So i am calling this a clear case of MD. Did i get it right?
Not Mechanical doubling.. It's DDD - Die Deterioration doubling. That's the other kind of worthless doubling that is also not a true Doubled Die variety. Both MD and DDD are flat and shelflike.. Some information https://www.error-ref.com/die-deterioration-doubling-incuse/
DDD is highly variable in its appearance. To say that DDD is flat and shelf-like is highly misleading. JMO. DDD starts to show on a coins surface when the sharp corner edges of the dies designs begin wear down due to the motion and abrasion of the metal rubbing over the surface of and inside the design elements of the die at a high rate of speed. It also has to be taken into account that fresh dies and worn die will allow the same type of abnormities to present themselves differently. Which is why DDD is highly variable. That is called Die Stage or Die State.
As noted by our fellow enthusiasts, DDD. Profiles and devices are affected with this eventual deterioration of the die. Irregular and uneven surfaces cause for the material to flow unevenly and in weird patterns. You see this largely on nickels and clad coins. If it looks like the device is oozing out from itself...DDD. Mechanical Doubling is the wobble and play in the tools/equipment. When there's play, the point at where it occurs determines the degree of damage to the coin. Usually, it affects the devices at Top Dead Center at the end of the stroke, creating the effects where the die is deepest (think inverted). The wobble smears the device creating the shelflike effect. Smaller, deeper devices appear to be the most affected in what I see from CRH events and outer devices where the moment is increased radially and the evidence is more pronounced.
A simple way to think about the difference between machine/ejection doubling vs. a doubled die... The effects of the machine causing it creates hard edges and straight lines/shelves as a result. The doubling mirrors the outline of the devices but ends up flat and or straight in some direction. The effects from true hub doubling are based in human error and appear softer in a sense. The doubling takes the same shape as the devices which got copied accidentally. In your spare time, read this entire website https://www.error-ref.com/doubled-dies/
Cool thanks. At least i am getting a little better. Now i understand that the difference is mostly due to how die deter You sir are an a$$, just saying, you know
