I'm admitedly ingnornat & uniformed please help
Inherited a WWII Walther PP from my dad, who got it from my uncle whom took from a police officer of some rank after Berlin fell. My dad never considered it a "heirloom", just simply kept-it tucked away in a paint can in a closet for home protection. I fired the weapon recently, and to my best knowledge that is the first time it's been touched in decades, since he taught me to shoot in the mid 70's. The blueing seems to be better than average everywhere except for the center of the grip and the end of the gun near the barrel where there is clearly some surface rust. I covered the weapon in gun-oil, but am reluctant to scrub-off the rust till I know that it will not hurt the value of the weapon. I'm admitatdly ignorant to gun collecting, but I can say that the rust could not impede the guns operation in any way, not that that would matter. Next to trigger: 190773 P, On barrel, and diretly below on breach is an eagle symbol (similar to ours?) with what looks like an N below each. Finally on the opposite side along the breach "Waffenbrik Walther, Zella-Mehils (Thur) with umlouds over the r. It also has the original holster, a leather item that straps to the belt with an extra holder on the outside for a clip. Any help would be greatly appreciated and paid forward.