I just found this quarter. When I hold it on its side, I can see the copper layer is on the very edge of the coin. The copper layer is only partially coming through but it looks like that on both sides. One side is definitely stronger than the other. The obverse side is kind of hard to see but you can definitely see it on the reverse.
Environmental damage. It is normal for the copper core to look slightly off center. This is caused when the blanks are punched from the strip.
I agree with the environmental damage consensus. It looks just like many of the coins that I find in the water with my metal detector.
Nah. If yours is missing the clad on BOTH sides (usually it's just 1), it will weigh very light. A clad quarter weighs 5.67 g. It would be less than 5 with both layers gone. Is this the newest You Tube trend, missing clad layers, and coins struck on foreign planchets? Here is what a partial missing clad will look like:
Your quarter (OP's) will weigh the normal weight of a clad quarter, within tolerance. Surfaces are damaged - all three layers are there.