Strange headstamps 7,92 Mausers

Hi

Can anybody tell me the manufacturer of the cartridge photo’s 1-3?
And the meaning of the dots?
383%20cart

383%20hs%202

383%20hs%201

Second, dit Metallwarenfabrik Treuenbritzen GmbH (P25) use already sectioned stamped cartridges?

28%20misstamp

Grtz
Jaco

This is a duplicate thread. See the other one.

Could not remove onze myself.🤔