Off Metal / Plating Error 2009 P Whh Presidential $1 Coin

It looks plated to me which means post mint damage. There are companies who put coins through a plating process to make them look different and then sell them in a set to people (usually non collectors or beginning collectors). When the buyers want to sell the coins and find out they are not worth more than face value they spend them.

A few tests tests to find if is OMS or plated:

1.) Weigh it. If OMS, the weight may be slightly different.

2.) Comparison ring test with known standard coin.

3.) File a tiny nick off the edge, and examine the substrate metal for different color with a microscope.

4.) Examine an area that has sharpest detail on a standard coin, and compare the same detail on the coin in question, using a microscope. Some definition is lost by a plated covering.

Aye there aren't any planchets handled by the Mint that it could be struck on by mistake that are that color.

It's most likely plated, but a scratch test is really the only thing that'll show it.