Stu, according to Jan Still"s Imperial Lugers, 1915 is a fairly high production year. The 1915 also has a pretty good finish, although not as nice as 1914 or earlier. Will come with the hold open and probably have a sear bar that was relieved later. ( You should buy Imperial Lugers by Jan Still if your are interested in that period)
I would not automatically rule out the double dates and police conversions as they are legitimate imperial lugers that have seen extended service. I have a 1915 DWM with full imperial proofs, a police sear safety, and a mid 1930's wermach proof eagle, that I like. I got it from Tom A. and it is a Thor rework. You might check with Tom A as he is having a "fire sale" I just bought a 1918 from him. This one has no post WWI markings but the fit and finish id somewhat rougher than the 1915. Not overly rough but more machining marks and not quite up to the quality of the 1915. You should also check with Thor as he often has P08s that he has refinished and some awaiting work. Thor's work is not cheap but it is very nicely done.
Heinz
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