Mine is a Zeil Dialyt in a Stoeger mount. The Stoeger mount looks (to me) identical to the Paul Jaeger mounts - was there some connection?
The Ziel Dialyt is a model of Hensoldt scope?
If never been able to prove one way or the other who made the Stoeger and Jaeger mounts of that period. I suspect that Franz Jäger (Jaeger) made them but I just don't know.
I didn't know Ziel and Hensoldt were from the same house - I assumed they were different companies. I always see them listed separately in catalogs.
I think Sedgley was pretty much out of the picture by the late 30's. My rifle came with a scope case that was signed by the owner and dated 1936. Didn't he pass away in 1939? All definitely pre-Featherweight. It could easily have been that whoever barreled up his actions turned down pre-rifled blanks to this profile. It would probably have been very easy to get pre-rifled blanks from Winchester or Springfield.
I expect analysis of the rifling specs (groove and land width and depth, twist) and perhaps even chamber specs would point you toward a probable origin, if compared with sporting barrels of the day.