Wrong/unplated plantchet, improper alloy, acid dipped, or post mint plated?

I have two cents here that are a bit odd. My error threads recently have all been dogs, so I decided to try again, but in a different direction.

The 1942 weighs 3.35g and the 1958-D weighs 3.05g (possible clues on the reverse?). Thanks again, everyone!

 

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The 1958 D appears to be plated and looks like it may have something stuck to the rev. Weight is within spec.

The 1942 is a little heavy. Color looks odd but I don't trust color on a computer screen

 

By no means am I saying this is what it is but it seems to kind of look a little bit like this. I'm no expert but this is interesting enough for me to look more into.