Mystery knife / Nepal?

[DaveA]

Hello all,

Here is a recent addition to my collection. I was entranced by the elaborate shape and the seller's story that this is a traditional ritual knife from Nepal. It certainly does not resemble a phurba!

Total length about 41cm. The blade has a slight diamond cross-section.

Attached are the seller's pictures. I have not yet received the item.

Any ideas? What is it?

Thanks,

Dave A.