French (?) F1 grenade ID

[Der_Feldgraue]

I bought it as french WW1 F1 with Model 1916 Billant fuze, but the grenade is missing the screw on the bottom. What type of F1 could it be? Thanks in advance.

 

[MINENAZ16]

As far as I know french grenade F1 could have been made without screw

 

[Der_Feldgraue]

Thank you, I only know them with that filling screw, mostly made of lead. Can the type without be dated? Do the stamps on it tell us anything?

 

[MINENAZ16]

Thank you, I only know them with that filling screw, mostly made of lead. Can the type without be dated? Do the stamps on it tell us anything?

Sorry I don't have a complete original list of grenade makers in France during WW1. I assume hundreds of small factories.
We have a lot of these grenades and none are made the same.

 

[Francesco_Dif]

BR: Pyrotechnie St Nicolas de Brest