On reflection my impression is of an oriental broad Machete blade of the style Yu Tao Dao better known as a Fish Head or Shark Head Sabre. Here is an example to compare shown below with a white hilt;
The monster fish decoration can be seen near the tip of the Sendai example and compares below with decoration at the throat of the weapon placed by The Late Vandoo (RIP) at thread on another Chinese weapon.
I believe the fish monster is the Makara and support that with detail at http://bharatkalyan97.blogspot.com/...ral-makara.html
where about 20 examples exist some going back to Chinese cave detai in the 5th Century AD.
The stone Makara carving is evidence of the Makara form on the sendai example etc. The big picture is Chinese whilst the smaller is in Lucknow Museum.
Ibrahiim al Balooshi.