I have lots of reference books, so maybe I can help you.
What, exactly, do you want to know? Please ask specific questions.
Without looking, I can suggest that your Radom pistol may be fairly valuable, since it seems to have WW2 German Waffenamt stampings on it. If the holster is military issue, the combination is possibly extremely valuable.
The "77" may indicate the manufacturer, under the Nazi-era Waffenamt system.
However, I would expect to see the entire Nazi-eagle insignia, not just a hakenkreuz.
Both specific questions and photographs (of the markings—many of us already know what a Radom pistol looks like) would be extremely helpful.