Some days ago I got fotos of very nice shotgun marked "Immanuel Meffert, Suhl". I have understood that this action is later version of mod."Hubertus". As you see this shotgun in in very good condition but I have some questions about it:

First, there seems to be no nitro markings so I suppose that this is for black powder only ? Correct ?

Second, what means those 14/1 markings beside proof marks ?