Does this coin exhibit Mechanical Doubling? The forehead, ear, and nose are the areas I have questions about. I have put arrows in the first picture showing the nose. The nose looks to a valley running up and down the length of it, but it is not complete. The second arrow from the top shows where the valley is missing and the third arrow continues with the valley. How was this "valley" caused? Thank you for the help!
My first thought was MD, but I looked it up on Variety Vista anyway and they don't show any DDO for a 1991P Kennedy Half, so my vote is Mechanical Doubling! Wait for other more knowledgeable members than me!
I have heard talk of a type of Mechanical doubling called Ejecting Doubling. Something about the coin hitting the die after the strike, as its being ejected from the striking chamber. Its all theoretical really. And still MD.
Alurid triggered a thought. Have a look at this link and the nested links at Error-ref.com - Machine Doubling (error-ref.com)
I have no verification for that question. If you have a link to any info I would like to read it. My concept of what I read was that Ejection Doubling is more likely to happen on the hammer side of a coin due to the powerful release of a coin from the collar die as it retracts away. Which in turn allows the coin pop up and hit the hammer die. I kind of thought about it as popping a cork out of a bottle.
It has come to my attention that my statement that ejection doubling is a form of Machine doubling is not a true or correct statement. (post #3) I post these two references for any one who wants to learn why. https://www.error-ref.com/machine-doubling/ https://www.error-ref.com/part_viii__post-strike_striking_chamber_mishaps/
It was error reference that did the work, We are lucky to have free easily accessed information at our fingertips.
