Hi my Brot. 
I'm backing completely what said Jim, 
it's not a "nimcha" even if the general shape for the handle remind a bit ... 
it's manifestly, a "Saïf"  
 
 
about the letters, the form of it, it's called "English form"
the 4 letters could be read as well as : " 
N D I A" ...
I can not imagine, that what do you suppose being erased, 
could might be, ... be an "I"   
 
 
anyway, I love his rough aspect, a "Saïf for a warrior" not for a court representation ...  
and it has his scabbard, that for me I consider as important 
 
MABROUK, and all the best
à +
Dom