I do believe the "HZaJt16" marking is a stamp from a Heers Zeugamt army arsenal. The Jt stands for the city the arsenal was in (Jngolstadt). The 16 is what repair depot it was. From my understanding this is a stamp on a part representing it was replaced by the arsenal. I also have a luger that has that stamp on the sear bar of mine. I think mine has a different number at the end of it.
Ed Tinkers "Police Lugers" book talks about this stamp in it on page 15.
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