It has a pre-1912 voluntary powder over bullet type stamp on the rifled tube but post 1912 on the scattergun tubes, which may be 70mm(note the 70 forward on the flats). Is there 70 forward on each flat? Is the D.R.G.M. 409728? With that & the small screws in the side of the frame, along with the serial number 23357?, I'm going to make a wild stab and say it was sourced from E. Schmidt & Habermann circa 1912. Is there an "ESHA" on any of the lugs or the standing breech? Let me dig for D.R.G.M. 409728, which is probably going be from 1909/1910?

Kind Regards,

Raimey
rse