To get much help with markings, and to get an estimate of finish and whether parts are appropriate, you'll need to post pictures that show more detail.
Try taking them outside, in shaded natural light. Do not use flash. Use a tripod, a plain neutral background and the closeup feature on a digital camera. Don't use a phone camera. Use the self timer on the camera to eliminate camera shake.
Late marks may be there because the part was replaced, or some rework was done. Mauser started manufacturing Lugers after 1933 when the DWM tooling and some of the staff was relocated to Oberndorf.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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