Very nice Luger. Congratulations.
The last picture shows marks that would be consistent with a grip accepted for an Erfurt Luger. It's possible that they were changed out at some point.
It's possible to repair the "Million Dollar Chip" that is broken off the left grip, should you want to do that.
This would be one of only 8-10,000 Reichswehr acquired 1921 Lugers. 2nd Company
There is an overview of the Reichswehr here:
http://www.feldgrau.com/main1.php?ID=1
Marc
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.