The idea that the blank toggles on 29 DWMs were left over from the canceled Riff Contract was discussed at length over a year ago in
http://forum.lugerforum.com/showthread.php?t=25442 and
http://luger.gunboards.com/showthrea...WM-BKIW-Lugers. In brief, the conclusion was that evidence strongly indicated that too many blank toggle Lugers were produced (approx. 15,000) to be explained by the Riff order for "a couple of thousand" pistols as recalled by August Weiss. Has additional evidence been discovered?
Regarding DWM/BKIW production of 9mm Lugers, my research has strongly suggested that, sometime following the disbandment of the IMKK in January 1927, they resumed manufacturing 9mm Lugers with 100mm barrels for the police. This too has been discussed on the forums (
http://luger.gunboards.com/showthrea...or-Joop-or-Don). While the pistol that started this thread may have been rebarreled in the late 1930s, I believe its original barrel was also 9mm.