The weakness could be due to a slightly weak strike or it could be due to an accumulation of grease. It's unlikely to be a planchet defect, since...
Yes, the coin shows the effects of intentional die abrasion ("die polishing").
Here are some recent examples: http://www.minterrornews.com/news-11-14-06-die_clashes.html
Looks like a die chip.
Misalignments as great as 40% are known. Also, among Lincoln cents from 1995 to 2000 there are a number of misaligned die clashes of this...
Because most of the first strike has been obliterated by the second strike, I'd estimate its value at $100. Still a very nice find.
Both coins have been vandalized.
That's a very nice clash indeed. You don't often get the impression of the bison's hind leg.
I see marginal shelving, which is consistent with machine doubling. I see no splits in the copper plating. There is no such term as "split...
The triple-clipped 1980-D cent is perfectly authentic. The fadeout and taper of the design rim is diagnostic, as is the Blakesley effect opposite...
Only if one face is uncentered or off-center and the other face is centered.
The reeding is produced by the collar at the moment of the strike.
I don't know where you're getting your pricing information, Joe, but this coin is worth about 2 dollars.
It's a slightly uncentered broadstrike. In other words, it was struck out-of-collar.
Vandalized outside the Mint. The grooves on the obverse, the flattening on both faces, and the fact that the coin is expanded and out-of-round...
That's what Condor101 is talking about.
Davidh, you haven't produced pictures of ANY double struck coins with an indent or strike-through on the second strike.
Machine doubling, without a doubt.
There are many examples of indents and partial brockages where the coin is struck fully within the collar. This is especially true of older coins.
It was most likely indented by an overlying planchet. These are called "indents" by the error hobby. The shape of an indent can vary, as can its...
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