A tiny flask for a tiny drunk?
We know a flask when we see one. You can’t convince us that this isn’t a flask for tiny men! Even if all of the evidence points in the opposite direction, we’re sticking to our guns. There’s a tiny person out there missing their inconspicuous alcohol container!
Even though one commenter informed the OP that this was a perfume flask, we’re sure you could use it for a couple of drops of booze. The needle allows the wearer to dab a bit of perfume on their neck whenever they need to freshen up. You could probably lick whisky off of the needle if you wanted to.