how old is my Breda Semi auto

[roadrocket]

i own a breda and wonder could you date it.
the markings on it are sb256131 cam70 kg0770 18.4 cl xx7 151047 .
i use this gun for clays and all kinds of game and find it superb thanks for any help you can give .

[dreamogenic1]

which semi model u have.

[roadrocket]

i do not know that is all of the markings on it.