Hi everyone, this is my first post on this forum. I bought a lot of british/candian/australian coins recently, and while looking through them I noticed that one of the ten cent coins was thinner than the others. I weighed it as well as a normal coin on a scale, and the thin coin weighs about .3 grams less than the normal one. Does anyone have any idea of what this could be?
Comparison (Kind of hard to see in photo, it's much more easy to see in person):
The thickness of the edge of a coin is a function of striking pressure, coins struck with high pressure will appear to be thicker because the rims are fully formed. Compare the edge of a proof coin with the edge of a business strike and you will see that the proof coin will almost always appear to be thicker.
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