Tibetan Phurba Ritual Dagger.(I think)

Hi, my name is Chris,

 I don't know if you can help me at all with a value or at least information about authenticity but here goes... I was giving a box of ornamental knives and weapons from a customer when I used to do a house removal/relocation job. In this box was the attached ornamental dagger. I have researched Ebay and Google and come up with pretty much nothing regarding authenticity etc.. So I would be very grateful if you guys know anything to give me some advice for selling this and whether you can tell it's authenticity from the photos. From some deeper research I found it may be a replica from a movie called Shadow, or The Shadow 1994. Not entirely sure though. Thank you, Chris