Information Please

I have a Luger with the toggle assembly and frame matching. The maker is ERFURT. The frame number is: 60398, with no letter. The receiver is numbered: 5685, and dated 1917. The barrel is un-numbered and marked: Made In Germany. On the left frame above the grip is etched: Pekrun 4. The frame has no stock lug or toggle hold open stop. The magazine is a 2 piece blued body with aluminum base. It is marked: 6861, above a script: C, above an eagle with 63 under it. All information is appreciated.