what happened to the rim of this dime?

There's no post-strike damage here. Most 1985-D dimes look like this, to one degree or another. It seems to be due to a combination of excessive die convexity (a design flaw) and inadequate upset (a planchet preparation flaw).

 

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I recant my previous statement. And I've learned something new. Thanks, Mike.

 

You'll also find the edge to be unusually tall, the rim/edge junction sharp, and the reeding very well-struck. All are indications of inadequate upset.

 

Well..........that kinda "upsets" me.....................<grin>

Actually, I saw this thread when it first came up and just didn't want to through a guess out there because what happened to this coin is just w-a-a-y above my pay grade and understanding!

 

I stand corrected and I learned from valuable colleagues