Peter, sounds very Germanic the 16.2 is the barrel diameter in mm, it would be .637 and that is 18ga?? More than likely an undersized 16ga or an oversized 20ga. the NPw is Nitro powder proof at Weipert , Austria- Hungary. Pictures would tell us a lot more.

Jim


I learn something every day, and a lot of times it's that what I learned the day before was wrong