Help dating a bayonet?

[Arachnamist]

I purchased a bayonet, and was wondering how i would date it (i'm a new collector, and think it would be a good idea to start getting more info on the art of collecting)
here's the info i know about it
It is an Italian M1891, for use with the 6.5 mm.
It was made at the State arms factory, Fabbrica D'Armi Di Terni (Arms Manufacturing of Terni).
"GH647" is its serial number
It has the brass-mounted leather scabbard
Any dating/ value info is greatly appreciated, below are some pictures (yes i know that they're horrible, i only have a cheap ipod camera)

Information

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[browningautorifle]

Looks like an 1891 Italian Carcano to me. Different scabbards are available but the mark in the first pic looks correct. Just google the rifles and that will give you the production bracket.