As others have observed, it's damage from a coin-wrapping machine.
While your coin could be a "brass plating" error, the color looks exaggerated. It's probably plated. Brassy plating errors occur when the...
I agree. However, I can't completely eliminate the possibility of post-strike damage.
You need 180 degrees rotation for a coin to be designated "medallic alignment" or "medal alignment". I suppose a few degrees deviation either...
No. A state quarter with a 180 degree rotation would be worth at least $300 in uncirculated condition.
I also have an example of this particular rotated die error. Since both coins are rotated 180 degrees, it would imply a fixed rotation, rather...
It appears to be post-strike damage.
Some refer to these as "blundered" design elements. Repunched or over-punched is fine also. Better than a doubled die in my opinion.
It looks like an authentic quarter struck on a nickel planchet. In uncirculated condition, an example this old would be worth several hundred...
The fate of such dies seems to vary quite a bit. I suppose production quotas, the time of day (or night) the clash occurs, and how energetic the...
It was altered outside the Mint. I've seen plenty of others like it.
A "filled die" error. Pretty much the same as a "grease strike".
It could be a die gouge or a die chip. Such errors are relatively common and there is little demand for them.
The quarter missing a clad layer may be authentic. You need to ask for a weight. A genuine example should weigh about 4.7 grams. Some of his...
Agreed. A hammer job.
Post-strike damage. A "hammer job" or something akin to it.
I'd guess $100 or thereabouts.
I've seen one 1969-D dime struck on a copper core. There are a handful of dimes struck on foreign copper planchets. That's about it.
As others have concluded, it's a brockage from a struck fragment. A very nice find.
As you surmised, it was struck through grease.
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