Possible dime error?

[Spartcom5]

Hey guys just found this and I have no idea if it could be an error and somebody tampering with the coin.... However it is definitely heavier on the one side.

 

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[Styfflin]

I sure was excited at first glance of that dime. However, a CUD that huge would produce a very weak strike on the opposite side and your obverse looks quite normal. Just some PMD.

 

[Dozer D]

I found a dime just like that (on the reverse just like yours). Exact same markings of the flaw. I'll check my odd/errors jar to see if I kept it for the same reason.

 

[galenrog]

Post Mint Damage. Looks like some type of solder.