Hi Phil,
The "8.83" on the barrel is the barrel gauge - 8.83mm from land to land.
It looks like it has been refinished using the "salt" bluing process then buffed. Your gun would have originally been "rust blued" at the factory.
The markings on the right of the receiver are the proof marks applied as the pistol completed major stages of testing and acceptance. "WaA4" refers to a weapons inspection office. This gun is of the period of the Wiemar Republic.
Your much better pictures are much more helpful...
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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