Yes, this is a well known dagger type, and you can see exactly similar representations on Early Classical period sculptures in Central Jawa.
But you cannot see the blade.
The daggers, Prambanan I and Prambanan II show the blades, and on Prambanan II we can see the first representation of a dagger with keris-like characteristics.
The form of these daggers types comes from the leaf shaped blade that can be found all the way back to ancient Greece --- possibly even before this.
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