You are correct.. 99.999999999% zinc. The weight needs to be 3.1grams, for what you are looking for. 2.5 grams is not what you want.
Looks like s SD to me. It also has a look of a zincoln which would make this common. Beat ya to it! You know who I mean.
Don’t stop looking. But perhaps stop posting unless you actually have something? Or have a legitimate question? Not a 100% guaranteed that I have “x” only to not, time and time again. Just a thought.