7.9x57 WWI ID help please


I did a quick search here and all the pictures in all the relevant posts no longer show (thank you photobucket).

From what I have read, the HS info is as follows:
S67 - Brass case (67% copper)
S - manufacturer (Königliches Munitionsfabrik, Spandau, Germany)
9 - case lot number
15 - year of loading (1915).

How did I go?

Pretty well Mayhem but the 9 stands for September.

Thanks - so was it only when the P codes came in that the number at 6 o’clock indicated the case lot number?

The change to case lot numbers was done in 1926, while the P codes are older.
Around the same time the S* symbol was introduced.

Thank you.