Need ID on flashlight. Is it military

Attached pics show a flashlight that looks old and of military design. I was told it was fromAttachment 106788Attachment 106789Attachment 106790Attachment 106791 WWI. No markings found inside or out. If it is military from what country and what era. Thx

I believe it would be WW1 and looks like the US model...but hard to say exactly for me.

Thanks Jim.