7,92x57 Mauser Yugoslav Dummi with headstamp LZ

Here is a picture with Yugo 7,92x57 Dummi round. The construction is typical for this country, but I have never seen such headstamp before. What is a meaning of headstamp LZ?

Treshkin, we tried on this before:


Tahnk you, EOD!

I forget to check this topic