Bootle

[Schrapnel]

Good evening everyone.
I have a friend who found this bottle in a field in the North of France. Could someone identify it and provide me with some documents? It measures 48 cm without the tap and has a diameter of 10.5 cm.
Sincerely

 

[kiwieod]

some sort of oxygen/CO2 bottle

 

[sgdbdr]

I'd say for pneumatic mortar

 

[Schrapnel]

Good morning.
Do you have any documents or photos on this cylinder please ? Sincerely