Presidential Dollar Ulysses S. Grant (Weird Brown Color)

Hello, one day on register i was paid with this Ulysses S. Grant dollar coin. I found it very unique because of its brown like no luster obverse. What even made it more interesting was that the reverse (still somewhat more brown) still had the shine. I was just wondering if this is a mint error or not. Also if it is not an error what possible PMD could this be? I never saw any other Presidential dollar like this so i figured it had to be somewhat interesting. I put the coin and also put another Ulysses S. Grant dollar coin next to it so you could see what I mean. The one on the left is the one that I am inquiring about. The one on the right is a regular one for comparison. Thanks for all your input.

 

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Looks like normal tarshing to me. The Golden Dollars are known for that. What exactly caused it? Who knows? But something the coin was exposed to caused the coin to tarnish.

As an experiment why don't you take the untarnished coin in your photo and drop it on the ground in your yard? Leave it there for a few weeks and report back to us.

 

It may have taken a good vinegar or silver cleaner bath.

 

Here is a link that may explain what you're looking at better.I found one of these coins today. http://www.numismaticnews.net/article/problems_on_edge_damage_or_errors

 

It was probably in somebody's album. These coins don't hold up well in pretty much any circumstances. They turn an ugly brown color after just a few months in a Whitman. Haven't tried them in a Dansco yet.

 

If you have one that might be of some value put it in a air-tite holder and as for the dark color of the dollar like the article said they are only found in limited numbers each year so i plan on putting this one in a holder.

 

Thanks for the article and input from everyone. I read more about this and also learned of the mint trying to eliminate the spotting on these coins with some sort of wash. The wash was done at the mint to try to prevent the spotting on the coins. Later the mint just threw them in to circulation for the wash didn't show any effect on the coin until it left the mint. They call it "Experimental rinse" and it has different effects on the coin depending what solution they tried on it. Turns out this is one to hold on to until further information. Thanks everyone.