Ditto on what George has said WRT the unit markings on the grip.
At some point in time it has been proofed in England as evidenced by the stamps on the underside of the barrel and left receiver. "BNP" means "British Nitro Proof".
8.83 is the bore diameter in mm; approximately .348"
It's otherwise a typical 1916 DWM Luger although someone has scratched it... while "cleaning" no doubt.
When you record the information, list the date (1916), the make (DWM) barrel length (4") and the serial number on the front of the frame INCLUDING the suffix letter "e". Why? Because in 1916 there will be multiple DWM Lugers with a serial number the same as yours. The difference will be the suffix letter (a, b, c etc) or, in the case of the first 10,000 made, no suffix letter.
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