Your statement makes no sense. There's no such numismatic term as "parchment" and the thinness of a planchet has no bearing on how well copper...
Something would appear to be amiss. Perhaps your calibration weight was, itself, improperly calibrated. It's highly unlikely that a single roll...
I've consulted the US Mint's website and they will indeed make some special-issue cents of 95% copper alloy. Here's what it says: "These coins...
So you tested a reasonably large sample of recent (post-1982) cents and they came out to 2.5 grams (+/- .1g)?
You might want to check the accuracy of your scale.
95% copper cents were last produced in 1982. Since the middle of 1982 cents have been composed of copper-plated zinc.
That would be unrelated to both thin plating and a thin planchet. Nobody is quite sure what causes the starburst effect. You see it every so...
I have one of these thick 1987-D nickels and have seen others. They occur in other years. As Matt said, the coin metal strip is sometimes rolled...
A normal copper-plated zinc cent weighs 2.5 grams. I don't know where you got the figure of 2.62 grams. A completely unplated cent would average...
The terms "die adjustment strike", "die trial", and "set-up piece" are labels that simply reflect wishful thinking. Unless you were there at the...
It's an in-collar, first-strike brockage of the obverse design on the reverse face. A nickel remained behind in the striking chamber and another...
It's a fake. Someone pressed a cent into the obverse face of your cent. These are variously known as "vise jobs", "hammer jobs", "squeeze jobs",...
It's a manifestation of die deterioration. The swollen ridge just inside the design rim is clear evidence of this.
As I said, I have no good explanation at the physical/chemical level. But eyewitness testimony at least shows that the problem lies with the...
That's why it's such a puzzling phenomenon. The sintering scenario would perhaps be acceptable if it wasn't for the numerous underweight...
There is no difference between pre- and post-1982 examples. The two traditional theories amount to no more than wishful thinking, perhaps abetted...
No, that's not what I said, Jazzcoins. Your coin is a dirty, corroded piece of junk.
Actually, the mechanism you describe is a myth. It does not correspond to the physical evidence. 1. There has been no obvious source of copper...
I can't entirely exclude the possibility of a lamination error. What leads me to think it's more likely a struck-through error is the smooth...
As others have said, it appears to be a struck-through error. It is impossible to identify the precise nature of the foreign matter responsible...
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