- Thanks for the info on the other dime Mike. Another photo at end of
photo section. Seems this must have been struck with excessive
pressure to make it so thick. It does weigh 2.2 grams and is almost
double the thickness of othe dimes. Rich
- You are correct, Rich. This is called "finning" or a "finned rim".
A thin vertical flange of metal squeezes into the narrow gap between
die neck and collar as the result of excessive striking pressure. It
can also be due to a very slight amount of die tilt, which
concentrates pressure at one pole.
The Error Coin Encyclopedia repeats information obtained from the
Mint that this error is caused by an excessively large gap between
die neck and collar. This is completely wrong. The diameter of
these coins does not deviate from normal diameters, and the width of
the design rim is normal.
So it's just a matter of too much overall striking pressure, or too
much localized striking pressure.
--- In email@example.com, "Rich Johnson"
> Another photo at end of
> photo section. Seems this must have been struck with excessive
> pressure to make it so thick. It does weigh 2.2 grams and is almost
> double the thickness of other dimes. Rich