This amazing carved skull is alleged to be 300 years old, and come from a Buddhist monastery in Tibet. The owner posted images of the skull on a forum back in 2011 asking for more information about it:
I got this skull in March 2011 from an antiques shop in Vienna, Austria. Showed it to several experts and organizations, such as the Institute for Tibetan and Buddhistic Studies in Vienna, the Museum of Natural History Vienna and the Völkerkunde Museum. The Tibetan letters and most of the symbols got deciphered, but no one ever heard of a skull like that. Except one Tibetan Khenpo (Monk-Professor), who said such skulls where carved a long time ago to take a curse off a family or to guide the soul of a mislead human being on the right path. The guy who sold it to the auction house where the antiques shop got it from said that one of his ancestors used to be a medical doctor in Vienna. He travelled around Tibet and also gave medical treatment to an abbot of a Buddhist monastery. That abbot gave the skull amongst other relics to that doctor as a reward for his services. Allegedly around 300 years old.
The owner of the skull also pointed out the depiction, on the forehead area, of the Cittipati - the 'Lords of the Graveyard - apparently in a Tantric posture (the "bow and arrow"):
Anybody able to shed more light on this skull? Is it an historical occult artifact, or just a modern tourist trophy?