The first one appears to have verdigris. I would do an extended soak in acetone. I would put it in the AU range and worth about $12 USD Second one F15 or so... Value about $3 USD
Yes, I would soak that 1883 in acetone and distilled water too. I may use Verdi-care if that didn't work. I could see how a nickel could get verdigris due to the copper content.
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