David,
You luger markings indicate re-work and re-barrel in the late '30s/early 40's by the HZaJ20,
the Ingoldstat depot, with a Mauser barrel. The pistol was re-proved , see the HZ firing proof on the right side next to the barrel.
We're still waiting for that rear sight picture.
As I said before, it likely got the Erfurt part(there were still Erfurt spares floating around Germany after WWII!) when it was repaired and re-barreled. So I would not change the lever even if I found one.
HZa rebuilt pistols are not common; it would fit nicely in MY collection.
I love those re-worked L P08 pistols.
One would have to be into odd and re-built guns to want it, JMHO; or a shooter.
So I don't want to give any value, as I'd buy it- well it is worth about $400; so send it to me asap.