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Your coin:
Sometimes when the mint mark was hand applied by a man using a special punch, he would make two impressions in the die of the mint mark. When there were two marks made, this was known as a re-punched mint mark or RPM.
The following will help you identify actual doubled dies and RPMs:
Here is a way to find immediate answers when finding something you suspect is a doubled die or RPM:
Please click the following link:
Immediate Answers - How to find your Doubled Die or RPM online
Note:
If you do not find your coin listed using this easy method,
then you most likely have a damaged coin or other issues like (non collectable) machine doubling, die deterioration doubling, etc. (look these up at error-ref.com)