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Hello minigun,
The value would not in my opinion be decreased very little. If the pistol was in extremely nice condition, the filled in lettering would be looked at very little. Over the years some of these pistols have been cleaned over and over and over. As a matter of fact what is the first thing people do when they get a new (old) luger? They clean it and most pay little attention to the whited in letters! After several good cleanings the paint usually comes out anyway. I keep three things whited in on my pistols, the safety marking, the date and the manufacturer. I would suggest you get you a lacquer stick and white the safety marking back in.