One of the most unusual Lugers of any era is Georg Luger's personal 1904-05 model, a short-barreled special with cut down frame and custom 7-shot magazine. Both Michael Reese's "Luger Tips" and Charles Kenyon's "Lugers at Random" contain photos of the pistol, No. 10077B.
I noticed that the two books seem to show 10077B with different takedown levers. In Kenyon the lever is heavily chamfered and carries what looks like a stamp of some kind. In Reese the lever is sharp-edged and unmarked. Whatever the explanation for the anomaly may be, it would be of interest to collectors when such a historically significant gun is involved.
Moderator Note: The following photo was enhanced to better show the chamfering (beveling around the edge) of the checkering on the takedown lever and submitted by user ViggoG-