What do you mean by a "color change"? Any warping is not a good sign.
Both photos are still too fuzzy to be sure of anything. On the left side, does the obverse show any warping or distortion? Is the rim/edge...
1981 is far too early for an inverted die setup. The mint didn't start toying with obverse die as anvil die until 1992. This coin could have...
Another uncentered broadstrike. Almost an off-center strike. If part of the reverse design is cut off, then you could call it an off-center...
My diagnosis remains unchanged. However, I see you also have a slight horizontal misalignment of the obverse die.
It looks like the 2000-D cent is a combination error -- foreign planchet and a modest strike-through error. These foreign planchets come from the...
I am a board member of CONECA (Seat #4) and contribute at least one article to each issue of Errorscope. All three types of "double rims" are...
This is a copper-plated zinc cent. These could be "popped blisters" caused by subsurface corrosion between the copper plating and zinc core. Or...
There are at least six causes for an apparent "double rim". For otherwise normal quarters, the three chief causes are: 1. Slight horizontal...
Certainly it's possible for one of the clad layers to fall off the blank or planchet prior to the strike. But the affected face will have a...
Sounds like a broadstrike (a dime struck outside the retaining collar), and uncentered broadstrike, or a minor off-center strike. They're worth...
I've seen such quarters before. They are a complete mystery to me. The streaks may occur on quarters of a normal color. Abnormally colored...
The coins vary in appearance as the result of the thickness and extent of coverage of the obstructing material. Luster may vary, but the flattish...
It's all the same stuff, just different thicknesses and levels of coverage. Luster may vary, but the flattish design, the persistence of planchet...
And another... http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3956485371
Here's a more severe example: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3957383255
The viscous fluid was on both faces, affecting areas of the design and the field. It can be rather patchy in its distribution. These sorts of...
The bottom right coin could be a genuine curved or straight clip. The other three coins are damaged.
This coin is not damaged. It was struck through oil, grease, or a similar smooth, viscous fluid. The stuff often accumulates in the deepest...
Possibly a strike-through error (the narrow curved recess), along with some filled die action.
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