1966 Dime, possible doubling?

Hi Everyone,

I'm new to this hobby and have been taking great joy in it so far. With that said, I know very little even after studying photos and terms.

I finally found something cool last night and was hoping you can either confirm or explain what this is. I believe this could be machine doubling because the "R" has a nice double and it's lower than the rest of the "R". You can see in the pictures.

1. Is this a real doubled die, machine doubled, or....?
2. Can a doubled die only be on one letter or small area of a coin or does it have to be the entire coin?

Thank you all. Pictures are attached.

 

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That is MD. You can tell by the flat, step like appearance of the doubling.

DD would be notched.

 

Ok. Thanks. So machine doubling gives a step appearance while authentic doublied dies give a distinct imprint with notches. Is a machine doubled considered an error in any way? I heard it could be considered................damage.

 

There are different opinions on MD being an error. Some say it is, some say it isn't.

Here's a diagram to help distinguish between MD and DD:

 

Thank you!!! That is the best help I have found in understanding the difference. Perfect!