Does anyone know about this dagger type? redux

[Dan D'Silva]

I've seen a number of these daggers online described as "probably Achaemenid," but never with provenance, nor in any period art or museum catalogues. Does anyone know of any documented examples and where/when they actually come from?
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[Robert]

There are several features that make me question whether or not this is in fact a real artifact. I believe it is iron, but the metal use is strange to my eyes, certainly the spirals of the hilt seem odd. There is a lot of material there, where one would have expected the spirals to have been forged instead of being picked out in two disks. This would have made sense were the piece cast, but now look rather puzzling. The midrib is also very large, especially near the point.

[Dan D'Silva]

I didn't notice that about the spirals. They do give it a crude look. But, if it is fake, it could either be purely made-up, or based on something real.

[Robert]

If based on something real, I would expect the spirals to have been forged and the copy being a crude representation from a bad picture. Not saying it is a fake, but as I said, several puzzling aspects to it. Not something I would recommend buying, that's all.

[Dan D'Silva]

Oh, I'm not thinking of buying one! I'm really just wondering whether such a dagger type is known from documented excavations, without regard to whether any given example that may show up for sale is real or not.