These look like die scratches caused by intentional die abrasion ("die polishing").
It's a "die crack", not a "die break". Quite common.
It sounds like you have an unstruck dime planchet. If so, it's worth one or two dollars.
If you see a small spot of copper on the edge, it may or may not be the copper core. In an off-metal strike on a solid Cu-Ni planchet, fine...
Here are a number of questions that need to be addressed: 1. How does the "ring" sound, when you balance it on your finger and tap it with...
These are all minor, commonly encountered errors. Their market value is virtually nil.
I would agree that it is mechanical doubling.
The coin is showing signs of heavy die fatigue (die wear, die deterioration). It's rather common in nickels of this period.
Definitely a "grease strike". The coin was struck through a layer of gunk that clogged the recesses of the die. These sorts of errors are also...
It looks like a die chip. This is a pretty common area for chipping to occur in Lincoln cents.
Struck through some sort of coarse substance. Too rough for grease proper, but possibly a conglomeration of grease and metal dust.
Peculiar, especially if the doubling is restricted to this one digit. It's hard to say what kind of doubling this is without a close inspection...
This is not machine doubling but appears instead to be a peculiar form of die deterioration doubling that is largely or exclusively restricted to...
Looks like a dirty, stained, corroded cent to me.
On the "ghost" cent, check the rim and edge. If the design rim is absent, and if the rim/edge junction is beveled, then it's a weak strike. In...
All excellent references. Pleased be advised, though, that "abrasion doubling" is largely a myth. The vast majority of coins paraded as examples...
It's a scratch from a coin wrapping machine.
Depends what your baseline is. Compared to the total number of coins struck, these errors are rare. Compared to other types of errors, capped...
This is a capped die strike. The coin was struck through an obverse die cap. The cap had a wrinkled surface, which is pretty common. The cap...
The vast majority of these "bubbles" are created outside the mint, evidently by applying a source of heat, such as a blowtorch flame. As a...
Separate names with a comma.
