Your photo is a bit blurry, but it seems to me that the marks on your jug are like these below.

These are trademarks of silverplate of a company that I do not know, but I suppose that is from Bologna (Italy), although I'm not sure.
My assumption comes from the fact that the first brand seems to represent the two towers, symbol of Bologna, and also by the fact that, living in Bologna, I found a really great amount of pieces with these marks.
There are several variations of size, and, of course, in the letter contained in the shield.
Regards
Amena