1920 DWM 9mm History and Value

[dgolf]

I am new to information regarding Lugers. My dad gave me this gun and he got it from his dad. It seems to carry a common story with these.... supposed to be taken off a German soldier.

This is what I have:

1920 DWM Luger
Seems to have matching serial numbers (4143)
Handle is stamped .S.B.4769.
Grips do not appear to be original

I have attached some pictures as well. I hope this is helpful.

Any history and estimated value would be greatly appreciated.