Left hand parrying dagger with silver decoration

[Jim McDougall]

Originally Posted by alex8765

Thank you Jasper,
The dagger is very well balanced, so may be pommel is so big for better balance?

This does seem well put together as Jasper has noted.
The pommel is simply a component used to complete the ensemble of these composite elements, and really has no purpose for balance as far as I can imagine.
This looks very much like a stiletto (probably inspiring your idea of its being Italian), and Egerton Castle ("Schools and Masters of Fence", London, 1885, p.246) notes "...the dagger fell completely into disuse for fencing purposes, even in Spain and Italy soon after the 17th c. In the latter days it was a very reduced type, approximately to that of the stiletto".