the kurdish ones are quite consistent in size from my experience. the scabbard on mine fits perfectly. it came from a friend on another forum who had a spare, so was unlikely to have been made for mine.
anyway, the grip is 14.5 cm. long, the 'guard' portion is 3 cm. long. the 'pommel part is 3.3 cm. the central portion is 8.2 cm. long x 2.5 cm. across. the guard/pommel sections are 5 cm. across, it's about 2.3 cm. thick thruout. the blade is 22.2 cm. in a straight line from the centre of the grip/blade junction to the tip.
how my 4 fingers just fit:
hammer grip: thumb along 'guard' indexes the edge nicely.
sabre grip:
you can also 'palm' the pommel, thumb on the spine of the grip recess.
another middle eastern double edged dagger, a shibariya. (jordan/palestine) this one was described as an assassin's dagger.
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another shibariyah. not so fond of these versions, blade too wide in the wide bit and narrows too much towards the tip, also too durn fancy.
syrian jambiyah/shibriyah also way too showy for me.
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