unknown lamp France?

Hello
Anyone know what type of lantern this is? I honestly don't know.

 

Possibly a gas lamp ?

Put an upright mantle over possibly missing burner parts in red ring?

 

please post a picture of the top of the "tank"
I think I have seen a filling knob

 

more pictures

 

Looks like a filler cap in the top could it be some sort of gravity fed meths lamp??

 

Yes, i think so to gravity lamp