Nice Atomizer for sure. I know only a little about these, based on the three I have sold before. Atomizer are a hot item, Easy E-bay sale. As for the glass what you have is amethyst glass, again very sought after, I have a friend that would die over this piece based on that alone. The third point in your favor it sure appears to be at least pre 40's, Depression era, esp. since it has dark Amethyst Glass. Very elegant and unique. You have many thing going for you here. The only thing that hurts is you appear to be missing the ball. Based on what I have seen, which is only a little mind you, is your item will easily fetch you $35.00 to $50.00, if you can get a ball to replace the missing one, you would have a item that would sure bring in at least 3 in a bidding war that would end above $50.00 somewhere.
