Hi Robert,
Welcome to the forum.
These are unit marks. The first three in the top photo are Reichswehr 1919-1933. The bottom one in the top photo is a Navy property number, found only on Reichsmarine or Kriegsmarine Navy Lugers.
The bottom two photos are Imperial Army WWI unit marks. They will be found on 1908 1st Issue-1917 Lugers, and are very rare on 1918 dated Lugers.
Ron
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I Still Need DWM side plate #49... if anyone runs across a nice one.
What ~Rudyard Kipling~ said...
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