I think you have a perfectly normal dime that has been buried in the ground for a few years and recovered, possibly with a metal detector. This sort of environmental damage is very common on buried cupro-nickel and clad coins. A rub with a wire brush or sandpaper (please don't do that on a coin of numismatic interest!) would probably bring back the 'silver' colour!
You could carry it in you pocket a few months and see how it looks antiqued. The silver color will show again on the tops of the devices and the fields will stay red colored.
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