Hello,
You can clean the blade with oil, but that needs a long time.
The faster way is vinegar, but that has also some disadvantages.
The surface can become dull and you have to be carefully with leather and horn parts and the metal parts should be cleaned with water and oil after whole process.
I can't really see how bad the rust is. If it is bad I would clean it, but you have to accept to lose patina.
Because of the origin: I would say it is persian, but that is just a feeling.
Regards
Robin
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