Just A General Question

Yes and yes. You can search here above as needed or I'll search for known example's if needed later. Thanks, Doug.

There you go!



to the CCF!

Sometimes both types of doubling can be seen on the same coin, such as on the coin here which is also a nice article that describes the doubled die vs Machine Doubling. https://www.ngccoin.com/news/articl...ne-Doubling/

How about some attribution numbers? Finding a DDO and a DDR and MD on the same coin is like finding teeth on a rooster
John1

No they don't. The old saying might be rare as hens' teeth.
John1

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John, with fewer than 30 posts, I can be about certain that the OP does not even know what you mean by "attributions".
The question raised by the OP clearly gives the impression that some research has been done in this matter.
Your reply strikes me as rather dismissive rather than inspiring. Something like, "Come back when you know what you are talking about".
That is why people come here. To learn from the learned so that they may better understand. They seek advice, sometimes ridicule assertions, yes. And it can become frustrating to the more knowledgeable. They seek tutors, not flippant responses.
You cannot begin to imagine how much knowledge I have gained from this community and the references provided here. So much so, that I do a lot more reading here than chiming in.

I am quite certain that this new member gained little knowledge on their inquiry, as the focus of the question has been derailed. And now has shifted to rooster teeth!

I strongly disagree with this statement. Roosters having teeth is impossible, agreed? There are known examples of DDO with DDR, agreed? Doubled die hubs are varieties, agreed? Machine Doubling (MD) is a die event, agreed? Many die events are considered errors, agreed?

Roosters with teeth is impossible. A 1983 copper cent is impossible. A new variety is impossible. If it ain't listed somewheres, it don't exist. We'll where do you think all of the ones you look for came from? Someone found it!
Go camping for a week or two. Nothing clears a mind better.

My answer is Yes, but never forgot that in the MD category you has Double Die Deterioration, then is Machine Doubling and the Mechanical Doubling. What me I see more it is DD's and DDD.