Pulwar sword with engraved blade

[ALEX]

I agree the blade is etched.
For comparison, here is another tulwar with chiseled script. The script is similar to "aṣḥab al kahf "(seven sleepers) inscription common on Islamic metalworks, such as Safavid bowl pictured below.
To note, the script was added later in life of this tulwar as evidenced by the "lashes" mark visible underneath it, but not recently.