Anybody ,got some info.
I ask my friend!
to transport 9 shells
Dimensions d'un obus : BlaBla - Usinages
You box have special markings like on this one.
fusée d'artillerie - Artillerie - Forum Pages d'Histoire : artillerie - FORUM pages 14-18
So the shells are without light, during night fire, there was short flames from the piece.
never saw it but I don't collect Fench, I ask to a colleague, specialist in boom boom!
Thank you again Michel for your help on this item.