I will find out soon. I read that it has always been that the English were required by law to mark barrels sleeved if so. Don’t think sleeving was done there. Also you were correct about the marks there isn’t any difference between the v and crown from Germany or London they look identical. These as Raimey has pointed out are nonetheless German. I will share any information I can find when gun is in hand, maybe it will provide some new information about these actions. I do prefer them above most!