Hi Cornelis,
There are some odd things that I don't quite understand about this blade, although having said that I am far from qualified regarding blade technology. The blade to my mind appears to have been cast rather than forged and I'm sure I can see some regular tool marks that seem more modern. I hope that we can find some answers and to that end may I suggest you put the photo of the Arabic script on the Ethnographic Forum asking for a translation, this may go some way to resolving the mystery.
My Regards,
Norman.
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