German 7,9x57 "S 8 15 K67"

What is “K67”? It is AP and has something to do with bullet material?

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My only WWI Spandau case is from December 1915 (your case is from August) and is stamped S67, not K67. S67 indicates the brass used to make the case contained 67% copper. I guess (assume) this is the case here as well.

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Between 1914 and 16 there were some lots with K67. These were mostly SmK (AP) but not all, according the lists of dutch. I assume it is also indicating the copper content of the case and not the bullet type.

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In August 1914 a new „S“ cartridge was developed for the German air force. The name was; “S” with a heavy bullet.

At the same time, they also developed a bullet with a steel core. They called it SmK (Spitz mit Kern).

It had a better performance than the heavy ball, so this cartridge was introduced.
To make a difference against the normal “S” cartridge, it became a special head stamp.
Instead an “S” a “K” from Kern, (core) in the head stamp.
By the introduction from the 67% copper case the head stamp was K67.

In 1917 they thought the red anulus only was a good identifier and the cartridge became the S67 head stamp as all other brass cased ammo.

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