Pretty cool, but I wouldn't like to own one! Looks so scary!
But I guess in the Tibetan tradition, using skulls to depict something isn't out of the ordinary. Vajrayogini has a necklace around her made of skulls. I think skulls are used to remind us of impermanence and to also destroy our ego! Shows that eventually, we all end up like this. Well, gory, but true.
Never heard of a skull being used to remove curses .. doesn't sound like what Tibetan Buddhists would do, though I am not sure of the olden days. If anything, I think it would have been used to protect and prevent negative energies from entering a compound. Just guessing.
Isn't Cittipati an emanation of Vajrayogini?