Here are some stamps of similar nature.
The first is thought to be from perhaps Gujerat and the Kattee people who use the katar as a key symbol of state. The trisula is of course an important Hindu symbol.
Next is a tulwar with the upper ricasso quadrant stamp, I believe Urdu cartouche and the trisula again in key blade location.
Next a tulwar with possbly Urdu cartouche and close up in next image.
Next a khanda with katar and trisula .
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