1999 D Thin Dime

How could it possibly be that the weight is normal? Surely minting can't significantly change the density.

And by the way, my primary reason for responding here is so that I'll get email notices of replies. Is there a way to do this without having to make a junk post like this?

Probably the setup process didn't make the rim as high or the coin was pressed somewhere along the way. The weight is probably normal. I found a few 1997-D Cents that were thicker in circulation, but the weight was the same. You could feel the difference in your hand.

As Biokemist said thickness can be a function of the strike pressure. Surprisingly the greater the pressure the "thicker" the coin will be. If you have two planchets of the same weight and strike one softly and the other one hard the hard one will have the rim more fully struck up resulting in a thicker coin at the edge. The softly struck one will show some reeding but the edges will bevel down from the rim to the reeding on the ede and give you a thinner coin at the edge. Since the rims are where the coin meet when they are stacked a stack o well struck coins wil be taller than a stack of weakly struck ones. (This is why you can get miscounts when rolling coins based on the height of the stacks or the length of the roll.

Now the weight of the planchet can also be a factor in the thickness of the coin. An over weight planchet is also more likely to be well struck and an underweight one is more likely to be weakly struck. but until the coin is weighed you can't tell if the "thick" coin is because of an overweight planchet or just a strong strike. Conversely for the thin coin. Is it underweight or just weakly struck? Striking pressure tends to be the cause of thick an thin coins much more often than off weight planchets.

I was waiting for my digital scale to arrive and weighted the dime. The weight was at 2.22 to 2.23 gram, so nothing really substantial to say is off. Average normal weight is 2.27 gram from 2009 guide.

I just want to mention that I am still into coin collecting phases for awhile, but more so seriously involved this year. And I do have many things I need to learn from folks here in this forum. Thanks all who lend their knowledge.

Macmercury; would it be possible for you to weigh, perhaps 100 dimes individually? The idea is to make a table of multiples of 0.01 gram, say from 2.20 to 2.34, and count how many fall in each .01 gram slot. Then we'd see just how rare this one was, and also, perhaps, get an idea of how accurate the scale is.

P.S. No apologies necessary, jasper62; it's hard to communicate over the internet and I should have been more clear. I realize now that I have to "Log on" in order to have the button appear.