Randall Gibson, in his Krieghoff Lugers, describes a manufacturing difference of Mauser made lugers, with a hole at the upper part of the side groove (page 29). I just acquired a G date piece. It has NO hole on either side of the stocklug groove. I have noted from my limited experience, that all Mauser lugers, starting with the second variation of 1937, have not only the hole but the Mauser "hump" and the new bluing method where all the previously strawed parts are blued. Did the holes begin appearing when the "hump" began to appear? If so, could there be some connection between them with the manufacturing process. Has anyone observed the hole without the "hump" and conversely the "hump" without the hole? Would certainly like to see feedback as we examine those Mauser P08's.