Tell me again how to tell if incuse letters are doubled.

Maybe you should call James Wiles and Ken Potter and tell them this, as they have hundreds of Doubled Die Shield cents listed with doubled elements near the rim. Every one of which was struck with dies made with single squeeze technology.

 

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Stay on track, he's talking about quarters ...

 

Mike Diamond wrote a good article here: https://www.coinworld.com/news/us-c...cing-die-leaves-offset-incuse-machin.all.html

Ken Potter expands his description of incuse machine doubling here: http://www.numismaster.com/ta/numis/Article.jsp?ad=article&ArticleId=17345

Yeah, I saw that. I just spent a while searching the Google, and I can't find any. Maybe they don't exist? I tried looking for foreign coins with incuse design doubling, but couldn't find any of those either.

 

He's talking about single squeeze technology being the reason behind this claim, It has already been proven that the technology is still subject to human error the same as previous methods used. The doubling of central elements doesn't happen without uncontrolled movement of the hub. If it moves, then the whole hub moves, not just the center, to believe otherwise is shallow thinking.

 

There is nice doubling on the outside devices of the shield cent series . Cant argue with that . I was just talking about the ATB quaters, he was talking about ..

You know that's what his answer will be ..

 

If the entire face of the hub and die met at the same time, I'd agree. However, dies are conical - the center makes contact long before the rim. The doubling is going to occur primarily at the center. Is it possible that there may be minor doubling at the rim? Yeah, I guess it's possible - but nothing as severe as the machine doubling shown in earlier posts.

For more information, read the articles here:
http://doubleddie.com/58201.html
https://www.cointalk.com/threads/single-squeeze-hubbing.290233/
https://conecaonline.org/so-just-when-did-single-squeeze-hubbing-begin/

Of key note, Ken Potter addressed your Lincoln cent concern. If Ken Potter doesn't know, then I certainly don't; all I know is that it shouldn't happen:

 

Following is my understanding.

Hub doubling on incused designs will mimic mechanical doubling as seen on relief designs. The design element sits above the face of the die. When the hub is pressed into the die - initial contact is with the design element on the die. The metal of the design contained on the die is sheared as the design cavity in the hub is pressed until the hub's face meets the lower elevated face of the die.

On the other hand - Mechanical Doubling of incused designs will mimic hub doubling - similar to the type of doubled die consisting of extra thickness in the design devices. The chattering and movement causes the relief design element on the die to wallow out the design element (which is basically a hole) on the coin.