Ok thanks. And how could I recognise a post '50 model ( .45) Cause I work for pollice in my country and i need to identify the year of production of a blackpowder deringer .45. I cant find anythng that would hellp me in the litearature. Informations that I have found are wery unclear cause there was many models and many producers during the years. And most of all there is a huge lack of pictures. It's a wery old weapon so thats why I'm asking for help, and ewery information is wery usefull.