The lead-off coin seems to have a case of machine doubling (push doubling subtype). It can generate multiple "shelves" along the edge of the...
As others have said, it was struck on a planchet derived from rolled-thin quarter dollar stock.
It the material lies above the level of the surrounding metal, it may well have been deposited after the coin left the Mint. Then again,...
Jefferson's face was flattened outside the Mint. Whether by abrasion or crushing, I cannot tell.
Absence of reeding in a coin that shows no expansion is a sure sign of post-strike damage.
Your photos are too blurred to make a determination. It appears as if your dime lacks reeding. If so, your "collar clash" is what's left of the...
This form of die damage appears on cents from 1917 to 1945. Often paired, they are assumed to be caused by contact with a pair of reciprocating...
The missing details on Lincoln's bust are entirely due to overzealous intentional die abrasion.
I've seen many examples of cents struck on planchets that have had their plating scraped off to a greater or lesser degree. I've see no evidence...
Use of the term "incomplete plating" is generally confined to cases of incomplete copper deposition. Your cent would be better described as a...
You need to distinguish incomplete plating from damaged plating. The 2019-D cent and the 2019 cent were struck on planchets that had part of...
It's a form of split plating doubling. I wrote about it many years ago in my Coin World column. Here is the relevant paragraph: "These tiny...
The planchet was properly seated within the striking chamber.
Most 1985-D dimes look like this. It's the result of a combination of inadequate planchet upset and excessive die convexity.
Struck through "grease" and showing grease-mediated radial smear.
The problem with the die deformation scenario is that it would predict weaker-than-normal reeding. After all, if the perimeter of the obverse die...
As desertgem points out, chemical erosion is also a possibility.
The low weight, granular texture, and absence of the obverse design rim on the right strongly suggests that the design was mechanically removed...
This is not an error. The obverse was pummeled into mush outside the Mint.
This is a counterbrockage/clashed cap strike -- the most common of the eight types of brockage/counterbockage errors (still rare, though). A die...
Separate names with a comma.
