My latest Parabellum acquisition.
What I have been able to determine thus far...
This one began its service life as a 1914 DWM 'artillery', as evidenced by the notch (for the rear artillery sight) on the front of the chamber.
--barrel extension/receiver is an Erfurt mfg. spare part as evidenced by the imperial 'empty crown' acceptance proofs. The frame is from an early Navy luger as explained below.--
Was reworked in 1939/1940 timeframe by the HZA depot in Ingolstadt (HZa jt3 waffenampt proof). 4" barrel with Mauser 42 code, and 655 Waffenampt proof, force match by depot.
Mauser 42 code replacement grips with 655 Waffenampts.
Came with Hanael Police Eagle "L" mag with an rather beat-up crudely renumbered (not matching) WW1 Imperial-proofed wooden mag base.