It's a partial brockage. An nickel was struck into the planchet represented by your coin. The "reeding" is damage from a coin counting or coin...
I agree that it appears to be a severe case of blistered plating.
It's just stained. You can even see the normal clad peeking through at the high points of the design where the stain has worn through.
Very nice interior die break. It's not a "cud", as a cud, by definition, carries away the rim and at least a little bit of the field.
It looks like the plating has been disrupted or split by the force of the strike and the slight expansion of the planchet. We sometimes see this...
Weigh it. If weighs around 1.9 grams, then it's an authentic missing clad error. If it's the normal weight (2.27g) then it's just discolored....
If the weight is normal, then it's a "struck-through" error, probably a "grease strike".
Looks like post-strike damage to me.
I'm not sure what it is. The poor photo doesn't help. It could be a die chip, but this is not a common location for one to form. A bubble in...
Same thing. Machine doubling.
It's machine doubling (a.k.a. mechanical doubling, machine damage doubling, machine doubling damage, strike doubling, shift doubling, ejection...
<<Wow, that's fascinating, thanks! Let me see if I can't put this in my own words. You're saying the raised lines north and south of the "island"...
Conder101 is correct. You've got a die crack that is straddled by a retained interior die break. The latter occurs when and island of metal...
If one side is the normal color and the other side a copper color, then it's probably missing a clad layer. A Montana quarter with this error...
The ring test or drop test is not that diagnostic. It varies from coin to coin. Drop a large sample of war nickels and you'll see what I mean....
It appears to be an example of minor strike doubling (machine doubling).
The normal weight for a clad dime is 2.27 grams. There are no authenticated normal diameter, full weight, solid copper or copper-alloy dimes....
The reeding will still be there. The acid eats away at the ridges and grooves with equal gusto. However, the reeding will appear abnormal and...
The acid (or whatever corrosive liquid was used) eats away at all parts of the coin, including the edge. That's why the diameter is smaller than...
None of these are errors. The quarter and nickel were immersed and partly dissolved in a corrosive chemical. The dime was subjected to high...
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