I do not think the blade is "hollow", i.e. constructed from two flat-steel stamped halves that are welded together at the edges. Those are rounded, but yours is normally "triangled" with variable width of the rib along its course. I have never handled a " hollow" jambiya, but imagine that the blade will emit a " hollow" sound when struck. Also ( again imagining), the edges will show traces of the weld. When you get it in your hand, check and let us know.
Seems like a solid example.
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