Mr dewey (of dewey cleaning rods) customized some lugers prior to his untimely death in the late 60-early 70's. This is one that I know own. It bounced around a bit on the net before I got it, I only have info on it over the past 5 yrs. Note the rear sight, porting and custom barrel. Trigger was clearly worked on also, it is great! What a fun shooter.