1990D Dime with extra Reeding

What do you call this little mistake?

As you can see there is extra reeding on the edge of the Dime. They line up with the reeds on the outer rim. It's pretty cool. And the dime weighs a little more than the normal, 2.34G. There is nothing else notable, except that it's in really good condition. It was in a jar of coins that sat untouched for at least 30 years.

Thanks!

 

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I think your coin is referred to as a Collar Clash.
https://www.error-ref.com/misaligned-collar-clash/

 

Definitely a collar clash.
It can be found on many dimes.
Neat find but nothing really major.

 

Here's a nice collar clash

 

Woo Hoo! I found another one, now I have two! Great for my collection!

 

I have one and I counted the number of reeds, it has 290. Did any of you ever do that? It should have 291, I think, is that right?

 

Eddie, your oats may have fermented.

 

Nice collar clash.

 

I am new, I am learning a lot on this website, thank you for all the info!