From the typeface of the serial number digits on your Luger's frame, I think you have a 1935 (G) or 1936 or very early 1937 Mauser frame.
You can pick up some clues by looking at the milling pattern at the rear top of the frame. It's discussed in this article:
http://forum.lugerforum.com/showthre...ght=rear+frame
Also, the internal factory inspection marks may help identify manufacture.
Probably made from three guns. The frame, the receiver/barrel and the toggle train.
It looks like you have a nice shooter. Was there some grinding done on the frame near the trigger plate surface? You may find some issues when trying to replace this, as these areas were hand fitted at the factory, and must have been hand fitted when your pistol was assembled.
Marc
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.