Maybe it was an old gun that was proofed during WW2?
Let me add a couple of pointers for you about the 191
8-dated DWM P08 in Post #7 above.
1. It SHOULD have ALL-matching numbers, including the last two digits on each component, as you can see on the P08 [Lange]. Check that this is the case. If not, you have a 'bitza'. Please show us the right-hand side as well as the underneath of the barrel where it meets the frame. It should have the calibre in the form of something like 8,89 or similar - this is the actual bore designation in millimetres. Germany uses/ed the comma as a period in decimal numbering. It might, as smellie notes, be a replacement barrel, although this is unusual unless it had a calibre change from 7.65 Luger to 9mm Parabellum. That serial number on the frame, devoid of the usual letter suffix, is giving me the doubts, TBH.
2. The alloy-base magazine is a post-1936 replacement for the original wooden-based issue, that was serial numbered to match the pistol. The grips should also be numbered to the gun, but look astonishingly good. Removing them is NOT straighforward, after taking off the grip screw, slide the plate VERY carefully backwards at the top to disengage it from a small lip on the frame. If you don't, then you WILL chip off the top left corner of the grip. In Luger circles we call this the 25% chip - this is because it devalues the gun by an average of 25% of its value - and I am NOT kidding you.
3. The 'gold'-coloured trigger, take-down latch and safety catch [?] are typical of the earlier models of P08 up to 1936-ish, when Mauser took over production. Thereafter all were blued, and later phosphated until production ended in 1942 and it was replaced by the Walther P38. This 'gold' colour is not a coating, but a heat treatment called 'strawing'.
4. The original proof was still acceptable - the nazi eagle stamp is that of the Heereswaffenampt - the overseeing organisation that contracted, tested and accepted every single item that went bang, flash, KA-boom or illuminate used by the Wehrmacht during the war period.
As for the P08 [Lange], it was also issue to submarine and to Zeppelin airship crews.
tac, formerly of Lugerforum.com