Hello gents. I am working at 7th fort museum of Kaunas fortress in Lithuania. In our collection we have this 'mystery' round. Its calliber at the base is 14,8cm, lenght without fuze 36cm. It is marked at the base "3.7" and on each of three bronze studs a different marking, one of which seems to be an anchor, other unknown. Anchor is stamped on the side of fuze aswell. Deepest regards if someone is willing to identify this.















