[Edward Tinker]

I am sure others will chime it, was trying to give them a chance before I fumbled around.

Manufacturer is DWM and Proof shows it is a Imperial Luger made for WW1.

Caliber 7.65. This throws me off, must have been rebarreled and issued to a unit?
Are there other acceptance markings on the right receiver?

Chamber Inscription 1920-1918
This shows it was a DWM 1918 then brought into the Weimar military, the 1920 is a property marking for the Reichswehr

On the front of the finger grip is S Wpr. II 44. This is for a unit marking, my books are not right here with me.

Barrel length is 4 3/4".
This makes me feel it was rebarreled and sent to America, as the barrel length sounds odd, but I am not sure on this?

One small wrench type tool is also included.
This is the loading tool, also used to take the grips off of the gun.