I have a WaA E/77 Radom Vis35 which has been postwar reworked in West Germany. Like your Luger, it was reblued and has West German Nitro proofs but it's reproofing was done in Bavaria rather than Cologne. Apparently this was not uncommon if the owner of the pistol wished to shoot it and wanted to be sure that it was safe. Here's some photos:
http://boards.rennlist.com/lfupload/RadomLeftSide.JPG
http://boards.rennlist.com/lfupload/RadomRightSide.JPG
http://boards.rennlist.com/lfupload/RadomLeftFrame.JPG
http://boards.rennlist.com/lfupload/...RightFrame.JPG
http://boards.rennlist.com/lfupload/...jectorPort.JPG
http://boards.rennlist.com/lfupload/...iggerGuard.JPG