hello,
The snap posted is inverted. however, the readings are as below:
Su Jai (3rd letter is not clear) 1 4 6 Shri (next is not clear) Chan Dra
so this refers to the initials and an arsenal no. probably.
Also, based on the script style as well as the way it is done. it appears to have been done at some later point than the weapon itself.
Good Kukhri
Regards,
Bhushan