It looks like a series of small die chips. I don't think it's related to die deterioration since there are no obvious signs of die wear.
As others have already pointed out, it's a "hammer job" (a.k.a., "vise job", "squeeze job"). A copper disc was sandwiched between two large cents...
I'm not sure what's going on with the proof cent. The photos are too poor. It could be discolored, which is not that uncommon for proofs. These...
Since it is not attracted to a magnet, it's most likely struck on a foreign planchet. Canada strikes coins for many countries. It's value would...
Yes, it's a counterbrockage. A coin was struck on top of another coin that remained behind in the striking chamber. The top coin, with a...
I believe that PCGS now charges $40 for errors.
It would not be economical, as the coin's value does not exceed the cost of slabbing.
Actually, the premium can be rather impressive when dealing with die rotations of over 90 degrees. The most popular ones are 180 degrees ("medal...
It's a "straight clip". The blank was punched out from the leading edge or the trailing edge of the coin metal strip. I'm not sure why the...
By "common" I'm referring to this type of error relative to other types of errors. Clash marks are rather common, although examples this strong...
Could be a collapsed blister in the plating, or a collapsed bubble pushed up by subsurface corrosion. However, the image is too small and the...
It's post-strike damage. The puffy letters and numbers are incompatible with a grease strike or any other error.
There is no such thing as an "overlapping rim cud". It's either a rim cud or a full-fledged cud. The first cent presented on this thread...
The 1836 dime shows a retained cud.
This 1830 dime is simply damaged. There are numerous impact depressoins on the obverse which cause the reverse face to bulge out in the same spots.
If the blemish is raised, then it's a cud (die break).
There is no doubt that this is a relatively strong die clash. It's actually a double clash, since the columns of the Memorial are slightly...
It's post-strike damage. The elevated pressure ridges that flank the indentations are a dead giveaway.
It could be struck on a planchet that was improperly annealed. For reasons that are still not clear, excessive or prolonged heating in the...
The first coin shown on this thread is a victim of post-strike damage. Both surfaces were pounded into mush and some metal from the edge was...
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