Gentlemen
Sorry to come in so late, but I am afraid it is indeed a Palestinian dagger coming from the Northern parts of Israel / Palestine or south Syria. It may be mix of several daggers common to the area.
Generally the blades in daggers from the region covering Palestine, Israel, Syria, Jordan and Lebanon are divided into two main categories:
The Shyibria type with the re-curving blade (few examples shown above) which is common to the southern parts of Israel, to Jordan and to the Sinai peninsula
The Khanjar type, with the single curved blade, common to the northern parts of this region: North of Israel, South of Syria and Lebanon.
In both categories the handle will be of the standard “I” shaped, but made of whatever possible material found: wood, horn, bone, brass or any other metal, and the pommel in a variety of shapes: round, half round, triangular, slightly square and whatever the local maker had in mind when he produced the dagger.
A week ago, I have noticed in a small Israeli forum on Ethnographic weapons ( Unfortunately in Hebrew) a thread on this dagger:
It was collected in the 1973 war between Israel and Syria in a small village (Jubata el Hasheb, now in the international boundaries of Syria). The blade is in a shameful condition, the scabbard is a later scabbard of a Magdali Khanjar (this village is only 7 miles north of Magdal Shams, were the Magdali daggers were made), but the brass handle has a sticking similarity to the one posted above.
Hope this resolves the mystery
(Thanks to Mr. I. Meyuchas, who collected this dagger and was kind enough to allow me to post it here)