How on earth is this coin not cleaned?

It looks like someone put tape on the reverse, and only dipped a section.
http://www.ebay.com/itm/Wild-Toned-..._Individual&hash=item19d1275c9b#ht_500wt_1287

 

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I am certain that coin was in some type of cardboard holder held by tape.

 

It's not cleaned.

 

I would guess that as well. A lot more common that you think, and a fairly large reason coins were dipped in the 70's.

 

Tell us how you came to your conclusion.

 

Also very possible. Basically something was covering the areas that are not toned. I suppose if it was tape, it might have left glue residue behind.

 

How would you only dip part of one side???

 

Dip can be applied to only a certain area if you are careful and steady.

In this thread, I did only one side, but the same principle applies. On a large silver dollar like the Peace dollar, it wouldn't be too difficult. Although, straight lines would not be an easy thing.
http://www.cointalk.com/t205567/

 

I have a 1928 peace that has a big "x" across it from marks that look like tape as well but no residue.