I have a theory that this item in Topkapı Palace Museum Armory(which is identified as a executioner's sword for some reason) is actually a broken/short Naga sword that is fitted to a 19th-20th century(possibly european style) hilt and a scabbard.
I'd like to remind you that there are many blades from the İndian subcontinent and Soth East Asia in Topkapı Armoury; many of them rehilted.