Re: Old gun, loaded in the front. (sorry for the english, i am danish)
The repro makers often put on the crown and royal cipher to make the guns look more authentic. If your gun is marked "black powder only" it is obviously a reproduction since in the days of the original, as Alpo says, there was no other kind. It should also be marked with the country of origin and may have a serial number; neither would be on a genuine antique.