Thanks to all. I contacted some folks and looks like that my friend has something unique. No, this one is not artillery one, the rear sight is on the aft side of the receiver, as normal on Navy Lugers. All matching numbers (last 2 digits) on all parts, including Navy stamps on a left side. Waiting for more info from Germany. We’ve heard that this one could be done as a special (personal) order. As for import/export permits, well, this is something that noted collector is doing all the time, so I am assuming that he has them all, or at least working trough licensed dealer. Hope to have pictures by the end of the week. Unfortunately, we will not put them on the net, as friend requested. Maybe later, with numbers hidden.