I don't know whether that's a listed variety, but I'm convinced that's what it is - nice find! Now find one that has the date on it without acid and you've got something.
BTW, When I do (actually DID) bother restoring dates on nickels, I dipped the whole coin in the acid. Looks better to have the entire coin a bit pitted with detail rather than a spot on the obverse different and pitted and the rest of the coin is still flat. Just something to think about.