I am looking inside "Pandora's Box" also known as Anthony C. Tirri's book "Islamic weapons : Maghrib to Moghul" at the Chapter III : Arabian Peninsula showing Omani "kattara" (perhaps simply a local transliteration of Persian "Qadara" should one think ...) and while the shapes resemble this but on a closer examination resemblances fade away I would say ... As much as I hate to be in "opposition" once again I really dont think is Omani ...
Nevertheless the short description goes: "The Omani Kattara takes two primary forms, the similarity being that they almost have a straight double edged blade. The more frequently encountered Omani Kattar has a guardless hilt that evenly tappers from the shoulder of the blade up to a small cylindrical pommel. The less encountered Omani Kattara is a guarded straight blade double-edged sword with short downturned quillions. It has a heavier hexagonal pointed pommel , which acts as a counterweight to the long blade. "
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