7.92×57mm headstamp

An unknown meaning mark on the 7.92×57mm Mauser cases,probably be an unknown manufacturer’s reload mark.

Hello Magnum.

I was speaking with a Czech collector friend about your second image. He has the same cartridge in his collection and he said me, he thinks your cartrige its made by AEG Berlin.
He told me he bought the cartridge years ago in Poland
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Jiři/Pedro

Perhaps the Keller & Co. 1903 case was a contract round for China and that’s a Chinese reload mark. In 1903 about the only serious users of this caliber were Germany and China. Jack

It is AEG Berlin Germany.

The symbol found in the 7.9x57 cases shown in the first post is Chinese and correspond to the Jinan Arsenal.