Curious massive knife or machete

[francantolin]

I wanted to show you to this large, somewhat special machete knife, extremely massive, almost 1 cm thick at the heel and weight of more than a kilo.
The end of the blade looks like a Bowie and is really sharp

the handle looks more like a halberd with a shortened shaft. A litle Chinese Pu Dao style ??.
the sheath has an original and interesting shape,

A whaler flensing knife ?
A colonial asian or african Riflemen machete ?
Just a butcher / knacker heavy knife ?

So, will you have an idea of ​​the origin?
I will receive this soon