We see these coins daily here: Metal detector finds usually. But any coin left outside will turn colors. Carry in you pocket a week with your change and the silver color will come back on the tops of the devices.
It looks to me like your dime has environmental damage. Were it missing clad, weight would be less than normal. Dime weight missing one clad layer = 1.863 g +/- 0.091 g; missing two clad layers = 1.453 g +/- .161 g
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