1957-D Lincoln Die Or Mach. Doubling ?

Machine doubled. One of the years the extreme Machine Doubling happened on Wheat cents. The machine doubled 1968 & 69 are the extreme ones for the memorial series. Not that it can't happen on other years, just more common on these three years.

Chiming in on Chuckster.
Nothing on the top or inside of the 57
It's just the pic. However, It is also on the upper
left side of the 7 (crossbar)
The MM is doubled on the right side only.
By the By, I keep forgetting what were the years on the
MM application by hand so to speak. When it started / stopped.
How then would the 57 MM also be doubled along with the date
if it was applied after... (depends on the answer I guess :)

Machine Doubling produces what the full name means: Machine Doubling Damage. The metal is pushed into an abnormal shape and usually never two from the same die pair is exactly alike. Movement varies with each strike. Some minor/major/monster MDD.

Die Deterioration is the opposite of what you are thinking. Die wear makes the devices wider as the die ages. When the die wear gets real sever (usually toward the rim)the wear get even larger and makes it appear there is a doubling of the devices, which is only because of the extreme die wear.

Earlier die state doubled dies that may be minor/medium in spread towards the rim, may wear away with use on the dies. This sometimes erase the doubling, so earlier die state coins will show the doubling better. But some of the stronger spreads will remain to later in the dies life.

Machine Doubling can affect doubled dies as well. I found one on the reverse of a Memorial cent. It is split in 1/2 right up the middle. The right half of the coin is a doubled die, the left 1/2 is Machine Doubling. Even the steps on the base tips are divided accordingly. So just because a coin is a variety, it can also suffer from Machine Doubling as well.

It all depends on the coin. What did it go through when struck/what dies were used/how the coin was handled till you got it. All are factors on coins. Every once in a while something new will find its way under your scope and you have to be open minded enough to recognize it.

It's still not clear to me, but I do have this Mint Errors book that I'm reading through and I'm hoping they have more detailed descriptions. I really want to reach the level where I can directly correlate most everything I see on a coin to a physical action in the minting process instead of relying on more generic descriptions like Machine Doubling.