New to me 1920 DWM nickel plated

[DonVoigt]

Spring is there, unless it it missing its "end"; perhaps you don't have it on the right side of
the tab on the grip safety.
Or the grip safety tab is missing.

That is a mixed up luger, a P 08 upper on an "06 model frame.
I believe the upper receiver is a 1920 dated DWM, but I cannot read the numbers on it or the barrel.

[Laf]

Thank you both for the reply. The spring is there but it appears to be too short or broken. The grip safety does have a tab but it is farther up and the spring doesn't come close to contacting it. I have a crudely annotated photo if that helps describe it.

The barrel has 1920 on the top and serial 2456 with 388 under it closer to the receiver and upside down compared to the serial. The frame has 31777 all over it and most of those parts all match with '77' stamped on them.