Unknown Experimental grenade (possibly 1ww French)

Here is a very unusual grenade. It has a segmented steel body constructed in two halfs. One fits inside the other and is secured by 3 small grub screws. There is a larger screw that closed the detonator well. On either end is a screw that closes the filling holes. The pin is offset to the side of one of the filling holes. Protruding from the side is a sprung loaded lever that is used to arm the grenade. The pin can only be removed when the lever is fully depressed

ANY INFO ON THIS ONE WOULD BE MUCH APPRECIATED.

Here the grenade has been taken apart so you can see the firing mechanism. The det holder is at 12 oclock

This picture shows the grenade armed. On the bottim of the det holder is a small firing pin

On impact the lever has snapped back hitting the firing pin and will in turn ignite the detonator. the mechanism is very sensitive.

Here the grenade is fully stripped to show all its components