Interesting coin. Rather than compare acid exposure to weak strike, I think the better comparison is acid exposure to thin planchet. Since your cent is underweight, those appears to be the two strongest candidates for explanation.
What's curious is that two of the diagnostics for acid exposure are thinned rims and thinned diameter, both of which are missing.
However, most thin planchets show weakness of the design at the rim, and I'm seeing weak design overall rather than at just the rim.
Corrosive wear, even though it doesn't match all the criteria, seems like the better choice given the grainy texture of the surface, but I have no preference to one explanation over the other.