Merc, you have an East German rework of an Imperial Erfurt Luger originally issued in 1917. The "1920" was added about 1920 or 1921 to indicate that it belonged to the Weimar government. IOW, it isn't really a "date" but is a property mark.
The markings on the front of the trigger guard means it's an Erfurt frame and the serial numbers on the frame and receiver match so it's likely that they are original to each other.
The toggle train, however, is not original to the pistol as evidenced by the marked out "30" which should be "86" (last two digits of the serial number) if it was original to the pistol.
The "753" under the barrel indicates that the barrel was made in July, 1953. The Crown/N is an East German proof. If you look in the chamber, you may see a visable line around the chamber about 2/3 of the way in. That means the barrel has been lined and you may also see the concentric circle at the muzzle where the liner was inserted. It's usually difficult to see because they did it quite nicely and then blued the muzzle along with the rest of the barrel.
There are several interesting markings you mentioned that I'm unfamiliar with but possibly indicate to whom the pistol was issued while being used by East German police.
The grips are clearly East German "VOPO" (People's Police) plastic grips and the magazine is WW2 military issue.
At the moment the East german reworks are not collectable but in time that may change. In any event, you have what should be a nice mismatched shooter with quite a history behind it. A good gun to own....... congratulations.
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