Thanks for all comments. Well, very interesting. In fact, I have shown it to a dealer friend of me as a third party ,who is well known and top level respected in market for his knowledge&experience about antique and archelogical , especially metal artifacts(but not a direct weapons specialist, who can determine age and tribe certainly). he seriously examined it with magnifier and dated not ancient but at least early or pre Ottoman and authentic, advising me not to sell it under a price almost 4 times of my purchase cost

.I would like to show it to someone else too, but he is the one to whom the other dealers often take their own artifacts to request for assistance

. Perhaps should I take the dagger back to my friend's place and sell it with a little profit to him?