I found this in a roll and the reverse appears to have a goldish color to it. The obverse has normal color that fades to the goldish color slightly. Is this an improper alloy mix or just unusual toning. The coin is 2.8 grams. THe pictures are of a normal zincoln and the coin which is a goldish color. Any input is appreciated.
Here's the obverse. The coin in question is on the left.

The coin in question is still on the left.

The coin in question is on the bottom.
