Axel:
I didn’t mean to press you into work. But I dropped the ball and didn’t connect the Bergers. I do know of Constans Louis Berger and Carl Ludwig Berger as well as the special entrance to the factory that held most interesting Wallon steel, if I remember correctly, as well gun barrels of Excelsior, their composition as well as data on pressure & stress test. Other steel articles accompanied the above in their glass cabinets. There was one word Bleiladung that I couldn’t place.

So if you have a Berger longarm it would be say pre-1873?

My hat's off to you for the effort.

Kind Regards,

Raimey
rse