This is just a common 1992 zinc Lincoln with a very thin copper plating. There is a lot of PMD on the obverse on the head and the discoloration you are seeing is simply environmental damage/discoloration. Very common on Zinc Lincolns. Not a mint error.
Use the search bar to browse through other conversations of doubled dies. Even on the threads about other coins that aren't doubled dies, you'll still learn about what to look for.
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