the dovetailed plates look to be the same width (can you measure and confirm?)
a fairly standard set-up on hunting rifles of a certain age in Germany.
both plates can be 'drifted' for 'windage' adjustment on the early, 'elevation only' adjustable scopes - before 'windage adjustable scope legs' were invented some time before WW2 - or perhaps earlier - can't remember now, getting old.
If (unlikely) the plates should be of different widths, then it can only be a specific manufacturers 'own' mounting system.
But unlikely I should think.
I have come across these things in the past and, as far as I remember, the plates were always identical in width.
In fact, I've got some 'legs' somewhere for that type of mounting system - 'lever' type, if I remember correctly.
Our friends in Germany should have an idea - I haven't lived there for more than 45 years, so am out of touch.
rgds
Gunter
