Neat Coin Received in Change Today

With Alabama quarters starting to circulate, I've been keeping an eye out in my change to see what comes up. Today as I was getting my change for an egg mcmuffin and coffee I received this:

Looked like a pretty beat up Alabama quarter which was odd, since they've only been in circulation for less than a month - anyway as I looked and turned the coin, this happened:

All of the sudden part of the lettering, including the mint mark dissapeared. When I brought it home and looked at it under a loupe, it appears that the coin was struck with a greased die, and the letters of United, Trust, and the mint mark, are almost invisible when you look at the coin at an angle. Weird and interesting little specimen.
Frank

Looked like a pretty beat up Alabama quarter which was odd, since they've only been in circulation for less than a month - anyway as I looked and turned the coin, this happened:

All of the sudden part of the lettering, including the mint mark dissapeared. When I brought it home and looked at it under a loupe, it appears that the coin was struck with a greased die, and the letters of United, Trust, and the mint mark, are almost invisible when you look at the coin at an angle. Weird and interesting little specimen.
Frank
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Comments
.............Ken
Glenn