1963-D-Roosevelt Dime- Clogged Mint Mark And D/D Error?

It does not appear to be a Repunched MintMark. It is Machine Doubling. Die chips inside mintmarks are very common as the depression in the center of the D , which is really a raised portion on the die is always prone to having small pieces of the die break away in that area.

For those who may be thinking that the raised line to to SE of the mintmark might be a portion of an RPM, look slightly to the left of that "raised line". There is a slight depression indicating that the metal was moved , probably a ding from another coin.

So, No RPM and the die chip is not uncommon.

Thanks,
Bill

I have a little time this morning so I am trying to be thorough instead of brief:-) , so.... a little explanation as opposed to , yep Machine Doubling and a clog :-)
I do want to add that the pictures , overall in this forum have become phenomenally good! Nice Job on yours!

Have Fun,
Bill