1998 D Dime Edge

What year is the dime in question? Was it normal circulated style dime, or was it pulled from a mint or proof set?

Taking a wild guess here without seeing the entire coin. I would have to say its strike related, or planchet overall size or shape.

The coin is struck and maybe its not quite the right thickness or wasn't hit hard enough for it to expand completely.

I did a google search and found this article;

http://www.coinworld.com/articles/u...aled-by-weak

Here are the obverse and reverse of the coin. I didn't notice anything else strange about the coin except for the mintmark looking a little odd.

This is an old topic. I just came across it looking for oddities in edge reeds for another coin. Someone said this is not possible in the minting process. That is wrong. This can be very common in the minting process. Most people just don't look at the reeding on their coins in their pocket. Coins in modern mints actually have a 3rd die. It's called the collar die. It is a die that fits between the obverse and reverse die. As the pressure comes down on the obverse and reverse die onto the planchet, the pressure causes the metal to expand outwards into this collar die. If the collar die is reeded, you get a reeded coin. If it is lettered, you get letters on the edge, etc... Sometimes, either the pressure is not even for whatever reason, or the planchet is thinner in one side or another, and you get a short collar mark. Make sense?

.....BadThad is Biokemist ?

I've seen this on the new cents as well. I Wonder how much of this could be attributed to counting machines?