Dear Forumites
Just my two cents. I would vote Iranian for a number of reasons. The first is the crown emblem engraved on several parts of the sword resembles the Qajar and Pahlavi state crown. I've seen it in books but I don't know if anyone on the forum has pictures of it. I can't seem to locate mine
Interestingly enough, the words engraved on both sides of the blade is Arabic letters are 'Watan' which is Arabic for Nation or Land of Origin (denotes nationalist sentiments?) and Badshah or I think the Turkish equivalent is Padishah, which is a sultanate and imperial title I think.
Anyway, I hope this helps.