Please help ID this Luger

[SoftwarePerson]

There is a single letter "I" under the number 1145 on the magazine. I can not seem to get a clear picture showing that.

The gun was stored in a black leather holster until I received it. I stored the gun and holster separately since. I will have to look for the holster as it is probably still boxed after my last move. Is there anything I should look for in the holster?

Attached are some more pictures. I did not see any marking on the front grip strap, but I did see an "N" and a "B" with the wood grip removed (last picture).

I have "The Luger Handbook" by Aarron Davis. It looks like my gun might match page 50, except I can not find a number on the extractor, thumb safety lever, or wood grip. Also where on the breech block should I find a number? I found matching numbers on the side plate, take down lever, toggle, and trigger. Not sure what part is the "receiver" that should have a number. Someone pointed out the extractor color was bit off from the barrel so it must be a replacement part per the person. So I wonder if other parts were replaced. Should the safety bar be blue steel instead of what is shown in the picture? Do the firing pin parts look authentic? There is wear on the toggle bolt which is why I stopped shooting it.