www.hermann-historica-ohg.de . This is the site of a German antiques auction company. You can see the better samples of the same type, and middle european bronze swords, belonging to another nomadic tribe, Kelts.
Most of the existing bronze age weapon samples belong to 2 main cultures as far as I have seen till now.
Schytian. Caucassia,Ukraine,Persia and Iraq. Name in the literature is Luristan culture.
Kelt . Middle Europe. Austria, Germany, Swiss, perhaps eastern France. Literature name is Hallstad culture.
Why samples of those two are seen much more, is perhaps that they were nomads , where not only noble soldiers, but all males were warriors living a tough life and needed to carry weapons to be strong enough to stay alive. I have seen pictures of Hittite or Babylonian ones too, some even having cuneiform inscriptions on them but samples belonging to those civilizations are more rare (maybe because of the this theory) and very expensive.