These belong to my grandfather. The larger one seems to say "Gnutti (CA) F 42", the other has no discernible markings. Any info?

http://imgur.com/gallery/or3v2

Edit: I am aware Gnutti made bayonets that look like this; I'm hoping someone has more info about this specific model.

Edit 2: Apparently it's spelled "bayonet". TIL