Jason, interestingly, I have 8248y and 8253y noted in my database. They are 42 (2 digit) dated Banners with Eagle N proofing on the left receiver and breechblock and have NO P.08 on the frame. In fact, from 8012y to 8280y none of these Banners have P.08 on their frames. There are known 42 (2 digit) Banners that have 655 proofed barrels. 655 acceptance on the right side of the receiver would probably indicate a 42 dated receiver was accepted by the military. The sideplate causes me more pain than anything. The internal numbers are not correct as you know. I could live with the sear-safety addition after it was made into a police pistol with the Eagle L added to the left side because the right side of the receiver was "full" of military acceptance. It is a late-produced/accepted Luger as you know. The y range was strickly for Banners...4 digit and 2 digit. The Su4 (Spandau) marked mag probably added after-the-fact. Why I don't know, but probably to add mystery to the pistol. I doubt Spandau had anything to do with the pistol. It would be a hard pistol to sell later because few would try to understand the situation or time frame it was produced. But at the present time, it would be a pleasure to own and try to determine more about it. JIM
