Another forum member, can't remember who, in another thread pointed out that the original fill of the Gesichert letters at the factory was actually wax, not paint. His comment surprised me so I checked Gortz & Sturgess and sure enough he was correct.
To me at least, the presence or not of any coloring material be it wax or paint in the Gesichert mark is irrelevant to value. That said, when it is present on an all-matching pistol I am careful to leave it alone. I suggest be more careful in the future to keep solvent off that part but if this was my pistol (I wish!
) I would not be concerned at all and would leave it just as it is now.
On my shooters, I do restore that marking with a combination of white, yellow and brown enamel paint to get the off-color white look.
Your pistol is an excellent example of a less common variant, congratulations.