Much of the designs used in decorating Omani Khanjars are not recorded and in fact the techniques are mainly done with a hammer and a 6 inch nail thus students trying to observe a technique often cannot find research …
There isn't any\much except
here at EAA and on the remarkable website at
http://www.khanjar.om/Materials.html.
Here are some further clues in Silver Omani Jewellery pieces … Please see
https://britishmuseum.org/pdf/BMTRB_..._and_Meeks.pdf