That is a really cool example of mechanical doubling, and great pictures!
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Interesting to see what new collectors think. Imagine people sitting around a table putting the mint mark S on 890,000,000 coins that year.
The reason it is called "shelf" doubling is that it looks like a shelf coming off the letters. Think of it as you think of a reef in an ocean. The land is above water the reef below, and it's a reef shelf that extends out into the ocean for a ways before it drops into the abyss. Looks just like it doesn't it?
bob
Registry: CC lowballs (boblindstrom), bobinvegas1989@yahoo.com
Comments
ejection doubling
Strike doubling
Machine doubling. Shelf doubling. What is the acceptable term ?
Bubkiss
Weren't the mint marks struck by hand back then how does it end up doubled as well?
They are punched into the die by hand, but it still becomes part of the die.
Nothing is as expensive as free money.
Via mechanical doubling
Mechanical Doubling, but still looks neat.
Jim
When a man who is honestly mistaken hears the truth, he will either quit being mistaken or cease to be honest....Abraham Lincoln
Patriotism is supporting your country all the time, and your government when it deserves it.....Mark Twain
Machine doubling happens during the strike.
It's definitely MDD. The mintmark is applied AFTER to die is made.
If it too has doubling, can't be a true doubled die.
Pete
Here is some info that explains mechanical/machine/strike doubling
https://www.doubleddie.com/144801.html
That is a really cool example of mechanical doubling, and great pictures!

Machine, mechanical, strike, shelf, slide, push "DOUBLING" - take your pick -
"When they can't find anything wrong with you, they create it!"
Great example of machine/mechanical doubling. No numismatic premium, but worth keeping in the 'education album'.... Cheers, RickO
Interesting to see what new collectors think. Imagine people sitting around a table putting the mint mark S on 890,000,000 coins that year.
The reason it is called "shelf" doubling is that it looks like a shelf coming off the letters. Think of it as you think of a reef in an ocean. The land is above water the reef below, and it's a reef shelf that extends out into the ocean for a ways before it drops into the abyss. Looks just like it doesn't it?
bob