I call it a carbine, but am note sure if this is the right term.
It has a calibre of approx. 17 mm; the barrel measures 43 cms; the total length is 74 cms and 54 cms. when folded.
Said to be a XVIII century Brescia work; i would love to hear more about these guns, namely and specialy who would be the maker... or the maker's school.
Thank you for your comments