Hi
This kind of koummiya is characteristic from the first quarter of the 20th c. around 1900-1920. The stamp, the scabbard, you will find a lot like that on the web. But your mark is really fine and pretty. They did a lot of imitations of European stamps, they also imported a lot of blades from the UK and Spain...
In this case you can have a very late 19th century blade in a koummiya from the beginning of 20th c.
Best
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