I think Manolo nailed it. The integral bolster is a typical feature of karakulaks, and these are still relatively cheap and abundant. How difficult would it be to take one such knife in poor shape and "machaira"-nize it? Not too difficult, I think - just cast a hilt in some fancy shape, such as an eagle head, age artificially and you are ready to go and take some fool's money on eBay.
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