What's with this Quarter?

I got this in some change the other day and I've never got one that looks like this. It looks as if it's rusted, but it has a smooth surface. Any idea what it could be? Thanks!

If you need better pictures, let me know, and I'll try to improve them.

 

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Maybe it was made without the clad, like this one http://cgi.ebay.com/1993-D-Missing-...QptZCoinsQ5fUSQ5fIndividualQQsalenotsupported

 

looks like someone found it with this.

 

Maybe it's a missing clad layer. Plus it's beat up pretty badly.

I have something similar and have been trying to figure out if this 1989-D Dime is missing it's clad layer. It's been soaking in distilled water a few days now to hopefully remove some of the built up dirt.

This coin was also posted here: http://www.cointalk.com/forum/t57536/#post618487

 

The dime could be different, but that quarter looks like it has started to corrode from the ground. Just my opinion and I could be wrong.

 

25c looks like a dug coin IMO

 

it looks like some one found that metal detecting

 

its looks dug up !

coins left in the ground get that dark look

here is a 1973 quarter that someone found - kinda the same look
http://www.cointalk.com/forum/t58473-2/

 

Lol, that's my auction :mouth:

But, yeah, looks like it was buried for a few years.

 

I metal detect and that looks just like the ones I have dug and cleaned up using my tumbler. Ice