My grandmother asked me if I wanted some items that belonged to my grandfather yesterday. I was hoping that it was the fabled Luger that he brought back from Europe after the war, but it instead turned out to be this five shot revolver that I've never seen before. She said he brought it back from the war. Can you help identify this? There are no manufacturers marks on it except for these two stamps that appear to be a crown and "N". It has a retractable trigger and apears to be a .22 cal. Any help would be appreciated.