Hi Yvain,
The Ottoman period in Palestine ended in 1917/1918 with Allenby's and the Egyptian expeditionary force's conquest of the area. Late Ottoman is usually meant late 19th to the end of ww1.
The large majority of these daggers come from GB, with some from Australia and New Zealand, so brought back by soldiers returning after the war and from British mandate in Palestine. Yours looks like an early type that has been well-used by the time it was bought, so it could be made before 1918, though not likely before 1900.
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