Probability is very, very high that the sporting weapon is a F.W. Keler Selbstspannerdrilling System Tip-Top & attained some form of protection:
"System Tip-Top is my own construction and protected by law. The gun receives a superior fashion and better balance by the short locks as other Hammerless with locks affixed on the trigger-plate."
More than likely a D.R.G.M.
I still see a very low probability that firearms merchant Adolph contributed much effort.
Loose some of those images.
Kind Regards,
Raimey
rse
