1973 D Kennedy Half (Need doubled die help)

I've had this coin for quite a while and hung onto it because I thought it was neat. Are there any experts out there that can tell me if this coin is the product of hub doubling, or is it worthless machine doubling, or something else entirely?

 

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I apologize in advance for the photos.

 

Shelf doubling, flat step like ledges. No extra value. Check out the first sticky post.

 

First sticky post?

 

A sticky post is a post that's "pinned" to the top of the forum, so it will always be at the top. In this subforum, Error Coins, there are 2. The first one deals with doubled dies and what is or isn't one.

 

Machine doubling, mechanical doubling, strike doubling, ejection doubling and now we have shelf doubling.

Chris

 

It all changes except for death & taxes. They are just trying to confuse us elders Chris.

 

Chris...how about MDD (Machine Damage Doubling).

Larry Nienaber

 

Thank you guys for the comments. I still have trouble distinguishing between the different types of doubling. But, I learn a little more every day.

 

The PDF in the first part of this link might help.

https://www.cointalk.com/threads/variety-error-coins.13902/