Imperial, Weimar, and 3rd Reich Luger

[Geo99]

Here is 1918 Luger, SN 4275h, I picked up recently that has evidence of service through all three periods of 20th century German military history.

This is what I have deduced:
This gun started life as 1918 WWI Imperial Luger.
After WWI it was accepted into Weimar military service in 1920 (not a police rework). It was reworked a second time by the Nazis for WWII military service sometime in the late 1930's.

I would say it has about 80% original blue left. Most of the wear is on the sideplate and grip straps (front strap is the worst).
Bore is only good - I call it early sewer pipe with strong rifling.

Grips appear to be original 3rd Reich rework replacements, correctly numbered with large numbers characteristic of the period. I believe the dished forward toggle axle is a correct Nazi rework part. (thanks Lugerdoc for explaining this to me).
Rear toggle rear axle is a correctly numbered Nazi rework part.

Here is where it gets interesting -

On the back of the frame is an "Eagle over mg10" stamp. The eagle has a broken wing.
All I could find out is this is a Nazi era acceptance stamp which is very rare on Lugers. I don't know what it means - machine gun unit?

The magazine is matching but has no suffix and an additional “75” stamp which I have not seen before - could this be from the last rework?

- Geo

Lots of pics below -