As attorney for an estate I would like to confirm this old H. Pieper double is Pre 1898, and also any information about the Diana model H. Pieper shotguns would be much appreciated. As I read the Belgian proof marks, it’s Pre 1893 and not earlier than the 1881 patent.. Thanks for all information, about grade and age. It seems to be a sound old Belgian double, and a rather fancy one. The barrel set rings, it locks up tight, there’s no pitting in the bores. It only has black powder proof, but what is that S* mark?