Identify this 1961 proof doubled die reverse?

tcarey has posted a photograph of his 1961 proof half with doubling on the reverse in this CT thread: http://www.cointalk.com/t71726/ His photos are on page three of the thread.
Can you help him identify if it is a doubled die or MD? You can post your reply to tcarey on this original thread: http://www.cointalk.com/t71726/
Very best regards,
collect89

 

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99.9% md.

 

Thanks

Thanks Collect89...

Good to know it is probably just MD. On to look for more!