Hexagonal stickgrenade ww1-era

This grenade might have been developed by Colonel Stender (USSR).
Of this hexagonal grenade body, two different versions exist.
There is a large ánd small version.

Who has more information?
Let me know.

Below: This is a body that I have in my own collection.
It is made of sheet steel with the lower tube and disc soldered to the body.

Width (over two flat sides): 80mm , Width (corner to corner): 88mm.
Height of casing: 55mm , height total (with tube): 83mm


The photos below and right show a smaller version, dimensions unknown.
Can anyone get me more info on it?

Origin of photos is unknown.