1957 D doubled die?

Going through some wheat pennies today and came across this. Is it an actual doubled die and are they common? Thanks in advance for any input.

 

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It's called mechanical or machine doubling. It's common and adds no additional value.

 

Md hope this helps.

 

To me, that seems to be a subtle difference between the OP and what the DD looks like. I would have thought it was DD based on the pics you posted. Please point out the differences.

 

Keep in mind a DD is a physical change to the DIE itself.

whereas a MD is an error in the squishing process and DDD
is an error based on the old age of the worn down die in the squishing process.

==> http://www.icgcoin.com/news/grading-room/identifying-doubled-dies/

go to the bottom of this page for DDD, etc.
==> https://en.wikipedia.org/wiki/Doubled_die

The big blobbish 9 is a die chip.

 

Machine Doubling reduces the size of the devices.

A DD will exhibit a size increase of the devices.

The picture posted above that Coop made shows this clearly.