Other forms of doubling:

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Other forms of doubling:

There are many reasons a coin can exhibit doubling.

Die wear, aka die deterioration doubling:

Dies can manifest an off set (shadow like) doubling that can appear raised or incuse depending on the composition of the coins struck. Typically the off set will be strongest along the periphery of the devices and head toward the rims. There may be the manifestation of heavy die flow lines.

A 2007P clad dime:

IMG_5917.JPG IMG_5914.JPG
Jefferson nickel showing centralized and periphery die wear:

IMG_4563.JPG IMG_4562.JPG
On a 1989D Lincoln cent where the plating is also impacted:

IMG_4020.JPG IMG_4021.JPG
On a 1953 Lincoln cent:

IMG_4615.JPG IMG_4616.JPG

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Die wear continued:

Jefferson nickel along the outside of Monticello:

IMG_4630.JPG IMG_4631.JPG
1937 Lincoln cent and just the 7 has die wear:

IMG_4599.JPG
The periphery of a wheat cent:
IMG_4598.JPG

And it is rampant on the 1943 steel cents:

IMG_5358.JPG IMG_5357.JPG

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Die wear:
this one is the type referred to a a poor mans doubled die (PMDD)

1955 DDD_b.jpg

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Post mint damage:

While not common, post mint damage, often just a localized hit, can mimic doubling:

The T from LIBERTY took a hit that looks like a notch, but is not.
Compare to 2009 1c FY DDO-001

PMD (doubling)b.jpg

Or here where the ear took a hit:

IMG_4581.JPG