Hello, Gentlemen,
I have to say that the grenade is really interesting

First, what stabilization system does it use?
We can probably agree that this is a variant of the "Lenk" system, i.e. Wilhelm Lenk von Wolfsberg.
However, it is quite different from the adopted system 1863 (M.63).
-The rise of the barrel is an order of magnitude lower...
-I'm guessing because it's probably for the ass.
As for the shell solution in the bottom, there is a hint of the Armstrong design...but only a hint. It's not England

- the radius of the front ogival does not completely exclude even German material (experimental).
The question is whether it is an imitation of a country other than Austria-Hungary or whether it is development material for the M.63 system...
So, in summary, there is a bit of every system available at the time
I do not believe that the M.63 system just fell from the sky without more types and designs. Unfortunately, I have similar poor development materials for it. ......
I have to say that I searched England, Switzerland, Italy, Germany, Russia, France, Croatia and nothing...
I'm mostly leaning towards cooperation between Germany and Austria-Hungary, but it's a pure guess

Akon