The P1 was a pear shaped cast iron grenade was prefragmented on the inside.
It was thrown after breaking the safetywire. The spoon would go in line with the body and a cloth with weight funtioned as a tail, all during flight.
Developed by the French Mr Billiant. Packed 50/wooden crate.

Heigth 120mm, Width 52mm.
Weigth 550gram including 30gram Cheddite.

The photo of the deployed P1 is property of Paul Spence.

You can find these on the French battlefields, if you're lucky.