Jp, the Swisswere the first nation to adopt parabellum pistols in 1906. The calibre of choice was 7.63.
As the OP specifically asked for "German" information your answer was totally correct. I just threw in the above for a bit more information.
His inquiry sparked a question that's been in the back of my mind for a long time. I was wondering, because of the position of the back sight if it might not be Swiss. The Swiss parabellums are probably the most basic of the whole line of pistols. The only frill would be the grip safety. Beautifully made though. Some of the German pistols although well made, looked quite crude by comparison.