What is the quistion?
The left and centre head stamps are from Spandau.
February 1897 and August 1895
The right one don
I have the cartridge on the right in my own collection. The same basic headstamp also appears in 7.63 x 25mm, often referred to as a Tokarev but in my opinion more likely, in the headstmap, to be a 7.63mm Mauser.
I do not know who made this 7.9 x 57mm round, but it is Chinese.