Simson only made 12,000 Lugers from the early 1920's (when they also rebuilt many WW-I guns) through 1933 when they were dissolved and the tooling shipped to Krieghoff.
So, Simson manufactured pistols and parts are rather scarce and valuable. The Eagle/6 inspector was assigned to the Simson plant.
If you want to have it "as nice as possible", I'd suggest that you're there right now, with repair of the hold-open spring. Just keep it protected with protective lubricant.
A proper restoration by someone that is expert on these will run several hundred dollars. A local shop might be able to do it for a lot less, but would end up doing something that was not authentic to it's original condition. In any case, the way it left the factory was probably quite different from the way your grandfather found it.
The process of "rust bluing" is quite different from hot salts bluing that is more commonly done. Search around and you'll find some interesting information on this and strawing...
Remember, during the war they didn't care about the markings on the parts - they just wanted Lugers to work properly.
It's very possible that the Simson part was installed during a factory, depot or an Army field armory rework.
Marc
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