I would say the Tibetan region for sure, though i don't know about that Monastery Guard reference in the auction.
Hard to tell age on this one, but i wouldn't think it is too old. Maybe early 20th century. I have one like this, but this one looks a little bit older. See this link:
http://www.vikingsword.com/vb/showth...=Tibetan+knife
Nice one BTW. I like these knives.