Cossack knife ? any informations ?

[francantolin]

Hello,

I just bought this old knife.
The seller called it a cossack boot-knife but I'm really not sure :
the stamp on the blade K. Marggraf Riga is the name from a 19th-early 20th century fabric of surgery blades in Riga , Latvia...

I found the shape of the blade really original and interesting.

Any idea of the (old) use of such a knife ?

Thank you !!